atomic: fixed missing windows.h include on win32
#else
# define cri_atomic_add(Val, Add) cri_atomic_add_impl((uintptr_t *) &(Val), (Add))
+# if defined (_WIN32)
+# include <windows.h>
+# endif
+
static inline uintptr_t cri_atomic_add_impl(uintptr_t *val, uintptr_t add)
{
# if defined (_WIN64)
