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

src/include/fe_utils/conditional.h

@@ -39,7 +39,7 @@ typedef enum ifState
 								 * false parent branch */
 	IFSTATE_ELSE_TRUE,			/* currently in an \else that is true and all
 								 * parent branches (if any) are true */
-	IFSTATE_ELSE_FALSE			/* currently in an \else that is false or
+	IFSTATE_ELSE_FALSE,			/* currently in an \else that is false or
 								 * ignored */
 } ifState;
 

src/include/fe_utils/print.h

@@ -36,7 +36,7 @@ enum printFormat
 	PRINT_LATEX_LONGTABLE,
 	PRINT_TROFF_MS,
 	PRINT_UNALIGNED,
-	PRINT_WRAPPED
+	PRINT_WRAPPED,
 	/* add your favourite output format here ... */
 };
 
@@ -55,7 +55,7 @@ typedef enum printTextRule
 	PRINT_RULE_TOP,				/* top horizontal line */
 	PRINT_RULE_MIDDLE,			/* intra-data horizontal line */
 	PRINT_RULE_BOTTOM,			/* bottom horizontal line */
-	PRINT_RULE_DATA				/* data line (hrule is unused here) */
+	PRINT_RULE_DATA,			/* data line (hrule is unused here) */
 } printTextRule;
 
 typedef enum printTextLineWrap
@@ -63,7 +63,7 @@ typedef enum printTextLineWrap
 	/* Line wrapping conditions */
 	PRINT_LINE_WRAP_NONE,		/* No wrapping */
 	PRINT_LINE_WRAP_WRAP,		/* Wraparound due to overlength line */
-	PRINT_LINE_WRAP_NEWLINE		/* Newline in data */
+	PRINT_LINE_WRAP_NEWLINE,	/* Newline in data */
 } printTextLineWrap;
 
 typedef enum printXheaderWidthType
@@ -99,7 +99,7 @@ typedef struct printTextFormat
 typedef enum unicode_linestyle
 {
 	UNICODE_LINESTYLE_SINGLE = 0,
-	UNICODE_LINESTYLE_DOUBLE
+	UNICODE_LINESTYLE_DOUBLE,
 } unicode_linestyle;
 
 struct separator

src/include/fe_utils/psqlscan.h

@@ -32,7 +32,7 @@ typedef enum
 	PSCAN_SEMICOLON,			/* found command-ending semicolon */
 	PSCAN_BACKSLASH,			/* found backslash command */
 	PSCAN_INCOMPLETE,			/* end of line, SQL statement incomplete */
-	PSCAN_EOL					/* end of line, SQL possibly complete */
+	PSCAN_EOL,					/* end of line, SQL possibly complete */
 } PsqlScanResult;
 
 /* Prompt type returned by psql_scan() */
@@ -45,7 +45,7 @@ typedef enum _promptStatus
 	PROMPT_DOUBLEQUOTE,
 	PROMPT_DOLLARQUOTE,
 	PROMPT_PAREN,
-	PROMPT_COPY
+	PROMPT_COPY,
 } promptStatus_t;
 
 /* Quoting request types for get_variable() callback */
@@ -54,7 +54,7 @@ typedef enum
 	PQUOTE_PLAIN,				/* just return the actual value */
 	PQUOTE_SQL_LITERAL,			/* add quotes to make a valid SQL literal */
 	PQUOTE_SQL_IDENT,			/* quote if needed to make a SQL identifier */
-	PQUOTE_SHELL_ARG			/* quote if needed to be safe in a shell cmd */
+	PQUOTE_SHELL_ARG,			/* quote if needed to be safe in a shell cmd */
 } PsqlScanQuoteType;
 
 /* Callback functions to be used by the lexer */