0026908: Visualization, TKOpenGl - eliminate -Wunused-parameter compiler warnings for Android target

Support TBO on OpenGL ES 3.2+

src/OpenGl/OpenGl_Structure.cxx

@@ -87,6 +87,8 @@ public:
     {
       theWorkspace->EnableTexture (aPrevTexture);
     }
+  #else
+    (void )theWorkspace;
   #endif
   }