Fix C++ compile failures in headers.

Avoid using "typeid" as a parameter name in header files, since that
is a C++ keyword.  These cases were introduced recently, in 04fe805a1
and 586b98fdf.

Since I'm an incurable neatnik, also rename these parameters in the
underlying function definitions.  That's not really necessary per
project rules, but I don't like function declarations that don't
quite agree with the underlying definitions.

Per src/tools/pginclude/cpluspluscheck.

src/backend/optimizer/plan/setrefs.c

@@ -2589,13 +2589,13 @@ record_plan_function_dependency(PlannerInfo *root, Oid funcid)
  * someday fix_expr_common might call it.
  */
 void
-record_plan_type_dependency(PlannerInfo *root, Oid typeid)
+record_plan_type_dependency(PlannerInfo *root, Oid typid)
 {
 	/*
 	 * As in record_plan_function_dependency, ignore the possibility that
 	 * someone would change a built-in domain.
 	 */
-	if (typeid >= (Oid) FirstBootstrapObjectId)
+	if (typid >= (Oid) FirstBootstrapObjectId)
 	{
 		PlanInvalItem *inval_item = makeNode(PlanInvalItem);
 
@@ -2606,7 +2606,7 @@ record_plan_type_dependency(PlannerInfo *root, Oid typeid)
 		 */
 		inval_item->cacheId = TYPEOID;
 		inval_item->hashValue = GetSysCacheHashValue1(TYPEOID,
-													  ObjectIdGetDatum(typeid));
+													  ObjectIdGetDatum(typid));
 
 		root->glob->invalItems = lappend(root->glob->invalItems, inval_item);
 	}

src/backend/utils/adt/varlena.c

@@ -69,7 +69,7 @@ typedef struct
 	int			last_returned;	/* Last comparison result (cache) */
 	bool		cache_blob;		/* Does buf2 contain strxfrm() blob, etc? */
 	bool		collate_c;
-	Oid			typeid;			/* Actual datatype (text/bpchar/bytea/name) */
+	Oid			typid;			/* Actual datatype (text/bpchar/bytea/name) */
 	hyperLogLogState abbr_card; /* Abbreviated key cardinality state */
 	hyperLogLogState full_card; /* Full key cardinality state */
 	double		prop_card;		/* Required cardinality proportion */
@@ -1835,7 +1835,7 @@ bttextsortsupport(PG_FUNCTION_ARGS)
  * this will not work with any other collation, though.
  */
 void
-varstr_sortsupport(SortSupport ssup, Oid typeid, Oid collid)
+varstr_sortsupport(SortSupport ssup, Oid typid, Oid collid)
 {
 	bool		abbreviate = ssup->abbreviate;
 	bool		collate_c = false;
@@ -1857,9 +1857,9 @@ varstr_sortsupport(SortSupport ssup, Oid typeid, Oid collid)
 	 */
 	if (lc_collate_is_c(collid))
 	{
-		if (typeid == BPCHAROID)
+		if (typid == BPCHAROID)
 			ssup->comparator = bpcharfastcmp_c;
-		else if (typeid == NAMEOID)
+		else if (typid == NAMEOID)
 		{
 			ssup->comparator = namefastcmp_c;
 			/* Not supporting abbreviation with type NAME, for now */
@@ -1910,7 +1910,7 @@ varstr_sortsupport(SortSupport ssup, Oid typeid, Oid collid)
 		/*
 		 * We use varlenafastcmp_locale except for type NAME.
 		 */
-		if (typeid == NAMEOID)
+		if (typid == NAMEOID)
 		{
 			ssup->comparator = namefastcmp_locale;
 			/* Not supporting abbreviation with type NAME, for now */
@@ -1983,7 +1983,7 @@ varstr_sortsupport(SortSupport ssup, Oid typeid, Oid collid)
 		 */
 		sss->cache_blob = true;
 		sss->collate_c = collate_c;
-		sss->typeid = typeid;
+		sss->typid = typid;
 		ssup->ssup_extra = sss;
 
 		/*
@@ -2160,7 +2160,7 @@ varstrfastcmp_locale(char *a1p, int len1, char *a2p, int len2, SortSupport ssup)
 		return 0;
 	}
 
-	if (sss->typeid == BPCHAROID)
+	if (sss->typid == BPCHAROID)
 	{
 		/* Get true number of bytes, ignoring trailing spaces */
 		len1 = bpchartruelen(a1p, len1);
@@ -2333,7 +2333,7 @@ varstr_abbrev_convert(Datum original, SortSupport ssup)
 	len = VARSIZE_ANY_EXHDR(authoritative);
 
 	/* Get number of bytes, ignoring trailing spaces */
-	if (sss->typeid == BPCHAROID)
+	if (sss->typid == BPCHAROID)
 		len = bpchartruelen(authoritative_data, len);
 
 	/*

src/include/optimizer/planmain.h

@@ -118,7 +118,7 @@ extern bool innerrel_is_unique(PlannerInfo *root,
  */
 extern Plan *set_plan_references(PlannerInfo *root, Plan *plan);
 extern void record_plan_function_dependency(PlannerInfo *root, Oid funcid);
-extern void record_plan_type_dependency(PlannerInfo *root, Oid typeid);
+extern void record_plan_type_dependency(PlannerInfo *root, Oid typid);
 extern void extract_query_dependencies(Node *query,
 						   List **relationOids,
 						   List **invalItems,

src/include/utils/varlena.h

@@ -17,7 +17,7 @@
 #include "utils/sortsupport.h"
 
 extern int	varstr_cmp(const char *arg1, int len1, const char *arg2, int len2, Oid collid);
-extern void varstr_sortsupport(SortSupport ssup, Oid typeid, Oid collid);
+extern void varstr_sortsupport(SortSupport ssup, Oid typid, Oid collid);
 extern int varstr_levenshtein(const char *source, int slen,
 				   const char *target, int tlen,
 				   int ins_c, int del_c, int sub_c,