0026784: Coding rules - eliminate GCC warning -Wunused-parameter

OSD_Thread - use pthread_timedjoin_np() instead of pthread_join() when available (glibc extension).
Suppress unused parameter warning in OSD_Signal, NCollection_WinHeapAllocator, OpenGl_Text, OpenGl_View, V3d_View and ViewerTest.

src/ViewerTest/ViewerTest_ViewerCommands.cxx

@@ -4275,6 +4275,8 @@ static int VPrintView (Draw_Interpretor& di, Standard_Integer argc,
                        const char** argv)
 {
 #ifndef _WIN32
+  (void )argc;
+  (void )argv;
   di << "Printing implemented only for WNT!\n";
   return 0;
 #else