qt3: move defaults to package file

pkgs/development/libraries/qt-3/default.nix

···
 , cursorSupport ? true, libXcursor ? null
 , threadSupport ? true
 , mysqlSupport ? false, mysql ? null
-, openglSupport ? false, libGLU_combined ? null, libXmu ? null
+, libGLSupported
+, openglSupport ? libGLSupported, libGLU_combined ? null, libXmu ? null
 , xlibsWrapper, xorgproto, zlib, libjpeg, libpng, which
 }:
 

pkgs/top-level/all-packages.nix

···
   qolibri = libsForQt5.callPackage ../applications/misc/qolibri { };
 
   qt3 = callPackage ../development/libraries/qt-3 {
-    openglSupport = libGLSupported;
     libpng = libpng12;
   };