remove warning for strptime

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-merge-1.4.x@769 152afb58-edef-0310-8abb-c4023f1b3aa9

src/http-header-glue.c

@@ -1,3 +1,5 @@
+#define _GNU_SOURCE
+
 #include <string.h>
 #include <errno.h>
 #include <time.h>

src/mod_staticfile.c

@@ -2,9 +2,6 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
-#define _XOPEN_SOURCE /* glibc 2.0 */
-#define __USE_XOPEN /* glibc 2.3 */
-#include <time.h>
 
 #include "base.h"
 #include "log.h"