Cleanup: silence unreferenced param warning in MSVC

This warning appears when the `WITH_BULLET` option is off.

source/blender/blenkernel/intern/rigidbody.c

@@ -2275,6 +2275,9 @@ void BKE_rigidbody_do_simulation(Depsgraph *depsgraph, Scene *scene, float ctime
 #  if defined(__GNUC__) || defined(__clang__)
 #    pragma GCC diagnostic push
 #    pragma GCC diagnostic ignored "-Wunused-parameter"
+#  elif defined(_MSC_VER)
+/* Suppress unreferenced formal parameter warning. */
+#    pragma warning(disable : 4100)
 #  endif
 
 void BKE_rigidbody_object_copy(Main *bmain, Object *ob_dst, const Object *ob_src, const int flag)