include: Fixed a C++-style single line comment. https://github.com/libsdl-org/SDL/commit/78725dc0cd8502a91d2565af44ff9e6e65f0f30d
diff --git a/include/SDL_mutex.h b/include/SDL_mutex.h
index 8fc237a..343824b 100644
--- a/include/SDL_mutex.h
+++ b/include/SDL_mutex.h
@@ -39,7 +39,7 @@
defined(__clang__) && (!defined(SWIG))
#define SDL_THREAD_ANNOTATION_ATTRIBUTE__(x) __attribute__((x))
#else
-#define SDL_THREAD_ANNOTATION_ATTRIBUTE__(x) // no-op
+#define SDL_THREAD_ANNOTATION_ATTRIBUTE__(x) /* no-op */
#endif
#define SDL_CAPABILITY(x) \