0024607: Fix some GCC compiler warnings

- enumeration value not handled in switch in Aspect_ColorScale.cxx, TNaming_DeltaOnModification.cxx
- comparison between signed and unsigned integer expressions in NIS_Triangulated.cxx, OSD_MAllocHook.cxx, RWStl.cxx
- static function defined or declared but not used in OpenGl_Workspace_2.cxx, ProjLib_ComputeApprox.cxx

src/TNaming/TNaming_DeltaOnModification.cxx

@@ -76,6 +76,7 @@ static void LoadNamedShape (TNaming_Builder& B,
       B.Generated(NS);
       break;
     }
+  case TNaming_REPLACE: // for compatibility
   case TNaming_GENERATED :
     {
       B.Generated(OS,NS);