Add trailing commas to enum definitions

Since C99, there can be a trailing comma after the last value in an
enum definition.  A lot of new code has been introducing this style on
the fly.  Some new patches are now taking an inconsistent approach to
this.  Some add the last comma on the fly if they add a new last
value, some are trying to preserve the existing style in each place,
some are even dropping the last comma if there was one.  We could
nudge this all in a consistent direction if we just add the trailing
commas everywhere once.

I omitted a few places where there was a fixed "last" value that will
always stay last.  I also skipped the header files of libpq and ecpg,
in case people want to use those with older compilers.  There were
also a small number of cases where the enum type wasn't used anywhere
(but the enum values were), which ended up confusing pgindent a bit,
so I left those alone.

Discussion: https://www.postgresql.org/message-id/flat/386f8c45-c8ac-4681-8add-e3b0852c1620%40eisentraut.org

contrib/amcheck/verify_heapam.c

@@ -43,7 +43,7 @@ typedef enum XidBoundsViolation
 	XID_IN_FUTURE,
 	XID_PRECEDES_CLUSTERMIN,
 	XID_PRECEDES_RELMIN,
-	XID_BOUNDS_OK
+	XID_BOUNDS_OK,
 } XidBoundsViolation;
 
 typedef enum XidCommitStatus
@@ -51,14 +51,14 @@ typedef enum XidCommitStatus
 	XID_COMMITTED,
 	XID_IS_CURRENT_XID,
 	XID_IN_PROGRESS,
-	XID_ABORTED
+	XID_ABORTED,
 } XidCommitStatus;
 
 typedef enum SkipPages
 {
 	SKIP_PAGES_ALL_FROZEN,
 	SKIP_PAGES_ALL_VISIBLE,
-	SKIP_PAGES_NONE
+	SKIP_PAGES_NONE,
 } SkipPages;
 
 /*

contrib/btree_gist/btree_gist.h

@@ -35,7 +35,7 @@ enum gbtree_type
 	gbt_t_bool,
 	gbt_t_inet,
 	gbt_t_uuid,
-	gbt_t_enum
+	gbt_t_enum,
 };
 
 #endif

contrib/pg_prewarm/pg_prewarm.c

@@ -33,7 +33,7 @@ typedef enum
 {
 	PREWARM_PREFETCH,
 	PREWARM_READ,
-	PREWARM_BUFFER
+	PREWARM_BUFFER,
 } PrewarmType;
 
 static PGIOAlignedBlock blockbuffer;

contrib/pg_stat_statements/pg_stat_statements.c

@@ -118,7 +118,7 @@ typedef enum pgssVersion
 	PGSS_V1_8,
 	PGSS_V1_9,
 	PGSS_V1_10,
-	PGSS_V1_11
+	PGSS_V1_11,
 } pgssVersion;
 
 typedef enum pgssStoreKind
@@ -282,7 +282,7 @@ typedef enum
 {
 	PGSS_TRACK_NONE,			/* track no statements */
 	PGSS_TRACK_TOP,				/* only top level statements */
-	PGSS_TRACK_ALL				/* all statements, including nested ones */
+	PGSS_TRACK_ALL,				/* all statements, including nested ones */
 }			PGSSTrackLevel;
 
 static const struct config_enum_entry track_options[] =

contrib/pg_surgery/heap_surgery.c

@@ -29,7 +29,7 @@ PG_MODULE_MAGIC;
 typedef enum HeapTupleForceOption
 {
 	HEAP_FORCE_KILL,
-	HEAP_FORCE_FREEZE
+	HEAP_FORCE_FREEZE,
 } HeapTupleForceOption;
 
 PG_FUNCTION_INFO_V1(heap_force_kill);

contrib/pgcrypto/pgp.h

@@ -38,7 +38,7 @@ enum PGP_S2K_TYPE
 {
 	PGP_S2K_SIMPLE = 0,
 	PGP_S2K_SALTED = 1,
-	PGP_S2K_ISALTED = 3
+	PGP_S2K_ISALTED = 3,
 };
 
 enum PGP_PKT_TYPE
@@ -60,7 +60,7 @@ enum PGP_PKT_TYPE
 	PGP_PKT_USER_ATTR = 17,
 	PGP_PKT_SYMENCRYPTED_DATA_MDC = 18,
 	PGP_PKT_MDC = 19,
-	PGP_PKT_PRIV_61 = 61		/* occurs in gpg secring */
+	PGP_PKT_PRIV_61 = 61,		/* occurs in gpg secring */
 };
 
 enum PGP_PUB_ALGO_TYPE
@@ -69,7 +69,7 @@ enum PGP_PUB_ALGO_TYPE
 	PGP_PUB_RSA_ENCRYPT = 2,
 	PGP_PUB_RSA_SIGN = 3,
 	PGP_PUB_ELG_ENCRYPT = 16,
-	PGP_PUB_DSA_SIGN = 17
+	PGP_PUB_DSA_SIGN = 17,
 };
 
 enum PGP_SYMENC_TYPE
@@ -84,7 +84,7 @@ enum PGP_SYMENC_TYPE
 	PGP_SYM_AES_128 = 7,		/* should */
 	PGP_SYM_AES_192 = 8,
 	PGP_SYM_AES_256 = 9,
-	PGP_SYM_TWOFISH = 10
+	PGP_SYM_TWOFISH = 10,
 };
 
 enum PGP_COMPR_TYPE
@@ -92,7 +92,7 @@ enum PGP_COMPR_TYPE
 	PGP_COMPR_NONE = 0,			/* must */
 	PGP_COMPR_ZIP = 1,			/* should */
 	PGP_COMPR_ZLIB = 2,
-	PGP_COMPR_BZIP2 = 3
+	PGP_COMPR_BZIP2 = 3,
 };
 
 enum PGP_DIGEST_TYPE
@@ -106,7 +106,7 @@ enum PGP_DIGEST_TYPE
 	PGP_DIGEST_HAVAL5_160 = 7,	/* obsolete */
 	PGP_DIGEST_SHA256 = 8,
 	PGP_DIGEST_SHA384 = 9,
-	PGP_DIGEST_SHA512 = 10
+	PGP_DIGEST_SHA512 = 10,
 };
 
 #define PGP_MAX_KEY    (256/8)

contrib/postgres_fdw/deparse.c

@@ -83,7 +83,7 @@ typedef enum
 								 * it has default collation that is not
 								 * traceable to a foreign Var */
 	FDW_COLLATE_SAFE,			/* collation derives from a foreign Var */
-	FDW_COLLATE_UNSAFE			/* collation is non-default and derives from
+	FDW_COLLATE_UNSAFE,			/* collation is non-default and derives from
 								 * something other than a foreign Var */
 } FDWCollateState;
 

contrib/postgres_fdw/postgres_fdw.c

@@ -82,7 +82,7 @@ enum FdwScanPrivateIndex
 	 * String describing join i.e. names of relations being joined and types
 	 * of join, added when the scan is join
 	 */
-	FdwScanPrivateRelations
+	FdwScanPrivateRelations,
 };
 
 /*
@@ -108,7 +108,7 @@ enum FdwModifyPrivateIndex
 	/* has-returning flag (as a Boolean node) */
 	FdwModifyPrivateHasReturning,
 	/* Integer list of attribute numbers retrieved by RETURNING */
-	FdwModifyPrivateRetrievedAttrs
+	FdwModifyPrivateRetrievedAttrs,
 };
 
 /*
@@ -129,7 +129,7 @@ enum FdwDirectModifyPrivateIndex
 	/* Integer list of attribute numbers retrieved by RETURNING */
 	FdwDirectModifyPrivateRetrievedAttrs,
 	/* set-processed flag (as a Boolean node) */
-	FdwDirectModifyPrivateSetProcessed
+	FdwDirectModifyPrivateSetProcessed,
 };
 
 /*
@@ -285,7 +285,7 @@ enum FdwPathPrivateIndex
 	/* has-final-sort flag (as a Boolean node) */
 	FdwPathPrivateHasFinalSort,
 	/* has-limit flag (as a Boolean node) */
-	FdwPathPrivateHasLimit
+	FdwPathPrivateHasLimit,
 };
 
 /* Struct for extra information passed to estimate_path_cost_size() */

contrib/postgres_fdw/postgres_fdw.h

@@ -143,7 +143,7 @@ typedef enum PgFdwSamplingMethod
 	ANALYZE_SAMPLE_AUTO,		/* choose by server version */
 	ANALYZE_SAMPLE_RANDOM,		/* remote random() */
 	ANALYZE_SAMPLE_SYSTEM,		/* TABLESAMPLE system */
-	ANALYZE_SAMPLE_BERNOULLI	/* TABLESAMPLE bernoulli */
+	ANALYZE_SAMPLE_BERNOULLI,	/* TABLESAMPLE bernoulli */
 } PgFdwSamplingMethod;
 
 /* in postgres_fdw.c */

contrib/vacuumlo/vacuumlo.c

@@ -35,7 +35,7 @@ enum trivalue
 {
 	TRI_DEFAULT,
 	TRI_NO,
-	TRI_YES
+	TRI_YES,
 };
 
 struct _param