Use re_search directly instead of regexec when using the GNU regex lib

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@36211 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

setup.h_vms

@@ -604,6 +604,11 @@
  * case WX_NO_REGEX_ADVANCED should be defined.
  */
 #undef WX_NO_REGEX_ADVANCED
+/*
+ * On GNU systems use re_search instead of regexec, since the latter does a
+ * strlen on the search text affecting the performance of some operations.
+ */
+#undef HAVE_RE_SEARCH
 /*
  * Use SDL for audio (Unix)
  */