db_perlvdb: fixed warning of using static function inside inline one

modules/db_perlvdb/perlvdbfunc.c

@@ -37,7 +37,7 @@
  * including decreasing ref cnt
  */
 
-inline long IV2int(SV *in) {
+long IV2int(SV *in) {
 	int ret = -1;
 
 	if (SvOK(in)) {