Fix build of tests with mingw very, very partial backport of 2f795d8fc50d81641d95723d9ddd92795886bed3 to maint/v0.21 branch without this include, O_RDWR and O_CREAT are undeclared when building tests/path/win32.c with mingw
diff --git a/src/path.h b/src/path.h
index 6c50334..444337b 100644
--- a/src/path.h
+++ b/src/path.h
@@ -8,6 +8,7 @@
#define INCLUDE_path_h__
#include "common.h"
+#include "posix.h"
#include "buffer.h"
#include "vector.h"