Merge pull request #192778 from NickCao/qtdeclarative-closure

qt6.qtdeclarative: reduce closure size by removing reference to qtbase.dev

pkgs/development/libraries/qt-6/modules/qtdeclarative.nix

···
     "bin/qmlscene"
     "bin/qmltestrunner"
   ];
+
+  NIX_CFLAGS_COMPILE = [
+    "-fmacro-prefix-map=${qtbase.dev}=qtbase.dev"
+  ];
 }