Revert "Merge pull request #109239 from poelzi/qt-debug-symbols"

This reverts commit 8f69090ba5, reversing
changes made to e6a852714a.

In 13e3ec0d58 this was already addressed

pkgs/development/libraries/qt-5/modules/qtbase.nix

@@ -165,9 +165,6 @@ stdenv.mkDerivation {
   qtQmlPrefix = "lib/qt-${qtCompatVersion}/qml";
   qtDocPrefix = "share/doc/qt-${qtCompatVersion}";
 
-  # don't strip away debugging symbols when build with developerBuild
-  dontStrip = developerBuild;
-
   setOutputFlags = false;
   preConfigure = ''
     export LD_LIBRARY_PATH="$PWD/lib:$PWD/plugins/platforms''${LD_LIBRARY_PATH:+:}$LD_LIBRARY_PATH"
@@ -260,7 +257,6 @@ stdenv.mkDerivation {
     ++ lib.optionals developerBuild [
       "-developer-build"
       "-no-warnings-are-errors"
-      "-force-debug-info"
     ]
     ++ (
       if (!stdenv.hostPlatform.isx86_64) then [