[PATCH v2] * builds/windows/ftsystem.c: Correctly detect UWP

This is not the proper way to detect API availability but it's the least-distuprive change possible to fix building for the GDK (Microsoft Store for games, Xbox).
---

Changes since v1:
* Added missing backslash

---

builds/windows/ftsystem.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/builds/windows/ftsystem.c b/builds/windows/ftsystem.c
index 3a56834f6..f8b7126ad 100644
--- a/builds/windows/ftsystem.c
+++ b/builds/windows/ftsystem.c
@@ -197,7 +197,8 @@
 
 
   /* non-desktop Universal Windows Platform */
-#if defined( WINAPI_FAMILY ) && WINAPI_FAMILY != WINAPI_FAMILY_DESKTOP_APP
+#if defined( WINAPI_FAMILY ) && WINAPI_FAMILY != WINAPI_FAMILY_DESKTOP_APP \
+  && WINAPI_FAMILY != WINAPI_FAMILY_GAMES
 
 #define PACK_DWORD64( hi, lo )  ( ( (DWORD64)(hi) << 32 ) | (DWORD)(lo) )
 
-- 
2.44.0.windows.1