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

diff --git a/misc/toolhelp.c b/misc/toolhelp.c
index d09f2a9..93178be 100644
--- a/misc/toolhelp.c
+++ b/misc/toolhelp.c
@@ -9,8 +9,8 @@
 #include <unistd.h>
 #include <ctype.h>
 #include <assert.h>
-#include "windows.h"
-#include "win.h"
+#include "winbase.h"
+#include "wine/winbase16.h"
 #include "winerror.h"
 #include "process.h"
 #include "tlhelp32.h"