Remove prototype for fmgr() function, which no longer exists.

Commit 5ded4bd214 removed the code
for this function, but neglected to remove the prototype and
associated comments.

Dagfinn Ilmari Mannsåker

Discussion: http://postgr.es/m/d8j4lmuxjzk.fsf@dalvik.ping.uio.no

src/include/fmgr.h

@@ -730,19 +730,4 @@ extern PGDLLIMPORT fmgr_hook_type fmgr_hook;
 #define FmgrHookIsNeeded(fn_oid)							\
 	(!needs_fmgr_hook ? false : (*needs_fmgr_hook)(fn_oid))
 
-/*
- * !!! OLD INTERFACE !!!
- *
- * fmgr() is the only remaining vestige of the old-style caller support
- * functions.  It's no longer used anywhere in the Postgres distribution,
- * but we should leave it around for a release or two to ease the transition
- * for user-supplied C functions.  OidFunctionCallN() replaces it for new
- * code.
- */
-
-/*
- * DEPRECATED, DO NOT USE IN NEW CODE
- */
-extern char *fmgr(Oid procedureId,...);
-
 #endif							/* FMGR_H */