windows: Include stdbool.h

windows_reset_all() returns a boolean value, so make sure we don't place
annoying requirements on the users.

Change-Id: I0f9a45256e2236c0a76696e2cc8a2df2ad0a98bd
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

windows.h

@@ -4,6 +4,8 @@
 #ifndef WINDOWS_H
 #define WINDOWS_H
 
+#include <stdbool.h>
+
 #define WINDOWS_NO_FLUSH	false
 #define WINDOWS_WITH_FLUSH	true