testffmpeg: use Uint64 instead of __u64

test/testffmpeg.c

@@ -56,7 +56,7 @@
 	(fourcc_mod_get_vendor(modifier) == DRM_FORMAT_MOD_VENDOR_## vendor)
 
 #define fourcc_mod_code(vendor, val) \
-	((((__u64)DRM_FORMAT_MOD_VENDOR_## vendor) << 56) | ((val) & 0x00ffffffffffffffULL))
+	((((Uint64)DRM_FORMAT_MOD_VENDOR_## vendor) << 56) | ((val) & 0x00ffffffffffffffULL))
 
 #define DRM_FORMAT_MOD_INVALID  fourcc_mod_code(NONE, DRM_FORMAT_RESERVED)
 #define DRM_FORMAT_MOD_LINEAR   fourcc_mod_code(NONE, 0)