quiet clang build warning

Author: davidly

ntvdm.cxx

@@ -4626,7 +4626,7 @@ uint8_t HighestDrivePresent()
 #endif
 } //HighestDrivePresent
 
-#if defined( __GNUC__ ) && !defined( __APPLE__ )     // bogus warning in g++ (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0
+#if defined( __GNUC__ ) && !defined( __APPLE__ ) && !defined( __clang__ )     // bogus warning in g++ (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0
 #pragma GCC diagnostic ignored "-Wstringop-overflow"
 #endif