New header varatt.h split off from postgres.h

This new header contains all the variable-length data types support
(TOAST support) from postgres.h, which isn't needed by large parts of
the backend code.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/ddcce239-0f29-6e62-4b47-1f8ca742addf%40enterprisedb.com

contrib/citext/citext.c

@@ -8,6 +8,7 @@
 #include "utils/builtins.h"
 #include "utils/formatting.h"
 #include "utils/varlena.h"
+#include "varatt.h"
 
 PG_MODULE_MAGIC;
 

contrib/cube/cubeparse.y

@@ -9,6 +9,7 @@
 #include "cubedata.h"
 #include "nodes/miscnodes.h"
 #include "utils/float.h"
+#include "varatt.h"
 
 /* All grammar constructs return strings */
 #define YYSTYPE char *

contrib/fuzzystrmatch/fuzzystrmatch.c

@@ -43,6 +43,7 @@
 #include "mb/pg_wchar.h"
 #include "utils/builtins.h"
 #include "utils/varlena.h"
+#include "varatt.h"
 
 PG_MODULE_MAGIC;
 

contrib/ltree/ltree_io.c

@@ -11,6 +11,7 @@
 #include "libpq/pqformat.h"
 #include "ltree.h"
 #include "utils/memutils.h"
+#include "varatt.h"
 
 
 typedef struct

contrib/ltree/ltxtquery_io.c

@@ -12,6 +12,7 @@
 #include "ltree.h"
 #include "miscadmin.h"
 #include "nodes/miscnodes.h"
+#include "varatt.h"
 
 
 /* parser's states */

contrib/pg_trgm/trgm_gin.c

@@ -7,6 +7,7 @@
 #include "access/stratnum.h"
 #include "fmgr.h"
 #include "trgm.h"
+#include "varatt.h"
 
 PG_FUNCTION_INFO_V1(gin_extract_trgm);
 PG_FUNCTION_INFO_V1(gin_extract_value_trgm);

contrib/pg_trgm/trgm_gist.c

@@ -8,6 +8,7 @@
 #include "fmgr.h"
 #include "port/pg_bitutils.h"
 #include "trgm.h"
+#include "varatt.h"
 
 /* gist_trgm_ops opclass options */
 typedef struct

contrib/pg_trgm/trgm_regexp.c

@@ -196,6 +196,7 @@
 #include "tsearch/ts_locale.h"
 #include "utils/hsearch.h"
 #include "utils/memutils.h"
+#include "varatt.h"
 
 /*
  * Uncomment (or use -DTRGM_REGEXP_DEBUG) to print debug info,

contrib/pgcrypto/pgcrypto.c

@@ -39,6 +39,7 @@
 #include "px.h"
 #include "utils/builtins.h"
 #include "utils/uuid.h"
+#include "varatt.h"
 
 PG_MODULE_MAGIC;
 

contrib/uuid-ossp/uuid-ossp.c

@@ -19,6 +19,7 @@
 #include "port/pg_bswap.h"
 #include "utils/builtins.h"
 #include "utils/uuid.h"
+#include "varatt.h"
 
 /*
  * It's possible that there's more than one uuid.h header file present.