[geom][mini] Disabling (temporarily) c++20 [[unlikely]] compiler hint. (#17413)

* [geom] Ignoring c++20 attributes when compiling bvh.h

* [geom] Ignore c++-20 attributes warning on Windows.

Author: agheata

geom/geom/src/TGeoParallelWorld.cxx

@@ -40,10 +40,16 @@ method.
 #include <mutex>
 
 // this is for the bvh acceleration stuff
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wall"
-#pragma GCC diagnostic ignored "-Wshadow"
-#pragma GCC diagnostic ignored "-Wunknown-pragmas"
+#if defined(__GNUC__)
+#  pragma GCC diagnostic push
+#  pragma GCC diagnostic ignored "-Wall"
+#  pragma GCC diagnostic ignored "-Wshadow"
+#  pragma GCC diagnostic ignored "-Wunknown-pragmas"
+#  pragma GCC diagnostic ignored "-Wattributes"
+#elif defined (_MSC_VER)
+#  pragma warning( push )
+#  pragma warning( disable : 5051)
+#endif
 
 // V2 BVH
 #include <bvh/v2/bvh.h>
@@ -1485,4 +1491,8 @@ void TGeoParallelWorld::TestVoxelGrid()
    }
 }
 
-#pragma GCC diagnostic pop
+#if defined(__GNUC__)
+#  pragma GCC diagnostic pop
+#elif defined (_MSC_VER)
+#  pragma warning( pop )
+#endif