Fix mismatched paren

https://gitlab.freedesktop.org/xorg/lib/libxt/-/merge_requests/72

--- a/include/X11/Xtos.h	2024-12-29 15:47:39.958280318 -0800
+++ b/include/X11/Xtos.h	2024-12-29 15:47:51.218234383 -0800
@@ -64,7 +64,7 @@
     defined(__s390x__) || \
     (defined(__hppa__) && defined(__LP64__)) || \
     defined(__amd64__) || defined(amd64) || \
-    defined(__powerpc64__))
+    defined(__powerpc64__)
 #define LONG64
 #endif