Removed a lot of unnecessary includes and fixed the compile errors.

diff --git a/dlls/comctl32/commctrl.c b/dlls/comctl32/commctrl.c
index b6bfa13..3168ce3 100644
--- a/dlls/comctl32/commctrl.c
+++ b/dlls/comctl32/commctrl.c
@@ -6,6 +6,8 @@
  *
  */
 
+#include <string.h>
+
 #include "winbase.h"
 #include "heap.h"
 #include "commctrl.h"