Removed a lot of occurences of windows.h (and added necessary other
includes).

diff --git a/dlls/msacm/msacm_main.c b/dlls/msacm/msacm_main.c
index ea65a5b..837418a 100644
--- a/dlls/msacm/msacm_main.c
+++ b/dlls/msacm/msacm_main.c
@@ -4,9 +4,8 @@
  *      Copyright 1998  Patrik Stridvall
  */
 
-#include "winerror.h"
 #include "winbase.h"
-#include "wintypes.h"
+#include "winerror.h"
 #include "msacm.h"
 #include "debug.h"