Include varlena functions (#1485)

There's already a pgrx::varlena module but utils/varlena.h adds
functions to manipulate GUC variables and identifiers.

Includes utils/sortsupport.h as a transitive inclusion, along
with varatt.h which is already transitively included.

pgrx-pg-sys/include/pg12.h

@@ -158,7 +158,9 @@
 #include "utils/sampling.h"
 #include "utils/selfuncs.h"
 #include "utils/snapmgr.h"
+#include "utils/sortsupport.h"
 #include "utils/catcache.h"
 #include "utils/syscache.h"
 #include "utils/typcache.h"
 #include "utils/rangetypes.h"
+#include "utils/varlena.h"

pgrx-pg-sys/include/pg13.h

@@ -155,7 +155,9 @@
 #include "utils/sampling.h"
 #include "utils/selfuncs.h"
 #include "utils/snapmgr.h"
+#include "utils/sortsupport.h"
 #include "utils/catcache.h"
 #include "utils/syscache.h"
 #include "utils/typcache.h"
 #include "utils/rangetypes.h"
+#include "utils/varlena.h"

pgrx-pg-sys/include/pg14.h

@@ -155,7 +155,9 @@
 #include "utils/sampling.h"
 #include "utils/selfuncs.h"
 #include "utils/snapmgr.h"
+#include "utils/sortsupport.h"
 #include "utils/catcache.h"
 #include "utils/syscache.h"
 #include "utils/typcache.h"
 #include "utils/rangetypes.h"
+#include "utils/varlena.h"

pgrx-pg-sys/include/pg15.h

@@ -156,7 +156,9 @@
 #include "utils/sampling.h"
 #include "utils/selfuncs.h"
 #include "utils/snapmgr.h"
+#include "utils/sortsupport.h"
 #include "utils/catcache.h"
 #include "utils/syscache.h"
 #include "utils/typcache.h"
 #include "utils/rangetypes.h"
+#include "utils/varlena.h"

pgrx-pg-sys/include/pg16.h

@@ -14,6 +14,7 @@
 #include "funcapi.h"
 #include "miscadmin.h"
 #include "pgstat.h"
+#include "varatt.h"
 
 #include "access/amapi.h"
 #include "access/genam.h"
@@ -156,7 +157,9 @@
 #include "utils/sampling.h"
 #include "utils/selfuncs.h"
 #include "utils/snapmgr.h"
+#include "utils/sortsupport.h"
 #include "utils/catcache.h"
 #include "utils/syscache.h"
 #include "utils/typcache.h"
 #include "utils/rangetypes.h"
+#include "utils/varlena.h"