Re-introduce check for sufficient PCRE version.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1612945 13f79535-47bb-0310-9956-ffa450edef68

server/util_pcre.c

@@ -48,6 +48,11 @@ POSSIBILITY OF SUCH DAMAGE.
 #include "apr_tables.h"
 #include "pcre.h"
 
+/* PCRE_DUPNAMES is only present since version 6.7 of PCRE */
+#ifndef PCRE_DUPNAMES
+#error PCRE Version 6.7 or later required!
+#else
+
 #define APR_WANT_STRFUNC
 #include "apr_want.h"
 
@@ -308,4 +313,6 @@ AP_DECLARE(int) ap_regname(const ap_regex_t *preg,
     return namecount;
 }
 
+#endif /* PCRE_DUPNAMES defined */
+
 /* End of pcreposix.c */