Workaround PRIu64 on Windows

On Windows, PRIu64 is defined to "llu", which is not supported:

    error: unknown conversion type character 'l' in format

app/src/control_msg.c

@@ -170,7 +170,12 @@ control_msg_log(const struct control_msg *msg) {
                          (long) msg->inject_touch_event.buttons);
             } else {
                 // numeric pointer id
-                LOG_CMSG("touch [id=%" PRIu64 "] %-4s position=%" PRIi32 ",%"
+#ifndef __WIN32
+# define PRIu64_ PRIu64
+#else
+# define PRIu64_ "I64u"  // Windows...
+#endif
+                LOG_CMSG("touch [id=%" PRIu64_ "] %-4s position=%" PRIi32 ",%"
                              PRIi32 " pressure=%g buttons=%06lx",
                          id,
                          MOTIONEVENT_ACTION_LABEL(action),