add missing dependency

wordpress/wordpress.spec

@@ -49,6 +49,7 @@ PreReq:       OpenPKG, openpkg >= 20060823
 PreReq:       apache
 PreReq:       apache::with_mod_php = yes
 PreReq:       apache::with_mod_php_mysql = yes
+PreReq:       apache::with_mod_php_pcre = yes
 AutoReq:      no
 AutoReqProv:  no