Standardize naming of malloc/realloc/strdup wrapper functions.

We had a number of variants on the theme of "malloc or die", with the
majority named like "pg_malloc", but by no means all.  Standardize on the
names pg_malloc, pg_malloc0, pg_realloc, pg_strdup.  Get rid of pg_calloc
entirely in favor of using pg_malloc0.

This is an essentially cosmetic change, so no back-patch.  (I did find
a couple of places where psql and pg_dump were using plain malloc or
strdup instead of the pg_ versions, but they don't look significant
enough to bother back-patching.)

src/bin/pg_basebackup/streamutil.h

@@ -16,7 +16,7 @@ extern PGconn *conn;
 	}
 
 
-char	   *xstrdup(const char *s);
-void	   *xmalloc0(int size);
+extern char *pg_strdup(const char *s);
+extern void *pg_malloc0(size_t size);
 
-PGconn	   *GetConnection(void);
+extern PGconn *GetConnection(void);