Removed resource-related "emergency collections"

New to-be-closed variables is a better way to ensure the proper release
of resources.

lauxlib.c

@@ -290,49 +290,6 @@ LUALIB_API int luaL_execresult (lua_State *L, int stat) {
 /* }====================================================== */
 
 
-/*
-** {======================================================
-** 'luaL_resourcetryagain'
-** This function uses 'errno' to check whether the last error was
-** related to lack of resources (e.g., not enough memory or too many
-** open files).  If so, the function performs a full garbage collection
-** to try to release resources, and then it returns 1 to signal to
-** the caller that it is worth trying again the failed operation.
-** Otherwise, it returns 0.  Because error codes are not ANSI C, the
-** code must handle any combination of error codes that are defined.
-** =======================================================
-*/
-
-LUALIB_API int luaL_resourcetryagain (lua_State *L) {
-
-/* these are the resource-related errors in Linux */
-#if defined(EMFILE) || defined(ENFILE) || defined(ENOMEM)
-
-#if !defined(EMFILE)	/* too many open files in the process */
-#define EMFILE		-1	/* if not defined, use an impossible value */
-#endif
-
-#if !defined(ENFILE)	/* too many open files in the system */
-#define ENFILE		-1
-#endif
-
-#if !defined(ENOMEM)	/* not enough memory */
-#define ENOMEM		-1
-#endif
-
-  if (errno == EMFILE || errno == ENFILE || errno == ENOMEM) {
-    lua_gc(L, LUA_GCCOLLECT);  /* try to release resources with a full GC */
-    return 1;  /* signal to try again the creation */
-  }
-
-#endif
-
-  return 0;  /* else, asume errors are not due to lack of resources */
-
-}
-
-/* }====================================================== */
-
 
 /*
 ** {======================================================