Even more includes

Expand the modulemap to cover some of the system headers too.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

src/dbus.c

@@ -9,11 +9,14 @@
  *
  */
 
+#include <string.h>
+#include <stdlib.h>
 #include <ctype.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <xcb/xcb.h>
 #include <X11/Xlib.h>
+#include <stdio.h>
 
 #include "common.h"
 #include "config.h"