Add missing includes

Signed-off-by: Julien Danjou <julien@danjou.info>

awesome-menu.c

@@ -30,10 +30,13 @@
 #include <dirent.h>
 #include <pwd.h>
 #include <sys/types.h>
+#include <sys/stat.h>
 #include <string.h>
 
 #include <confuse.h>
 
+#include <X11/Xutil.h>
+
 #include "common/swindow.h"
 #include "common/util.h"
 #include "common/version.h"

rules.c

@@ -19,6 +19,8 @@
  *
  */
 
+#include <X11/Xutil.h>
+
 #include "rules.h"
 #include "common/xutil.h"
 

uicb.c

@@ -28,6 +28,7 @@
 
 #include <sys/wait.h>
 #include <string.h>
+#include <unistd.h>
 
 #include "awesome.h"
 #include "tag.h"