MSVC compatibility fixes.

diff --git a/graphics/path.c b/graphics/path.c
index 256e9e9..bbca30a 100644
--- a/graphics/path.c
+++ b/graphics/path.c
@@ -20,6 +20,7 @@
  */
 
 #include "config.h"
+#include "wine/port.h"
 
 #include <assert.h>
 #include <math.h>