0024512: clang++ compiler complains about extra semicolon

Clang++ compiler emits warnings like these ones when parsing superfluous semicolons:
  .../src/OSD/OSD_MAllocHook.cxx:49:2: warning: extra ';' outside of a function is a C++11 extension [-Wc++11-extra-semi]
  .../src/ProjLib/ProjLib_ComputeApproxOnPolarSurface.cxx:317:30: warning: extra ';' after member function definition [-Wextra-semi]

src/OpenGl/OpenGl_Window.cxx

@@ -120,7 +120,7 @@ namespace
   }
 #endif
 
-};
+}
 
 // =======================================================================
 // function : OpenGl_Window