Merge pull request #254017 from cyber-murmel/klipper-cross

pkgs/servers/klipper/default.nix

···
       substituteInPlace $file \
         --replace '/usr/bin/env python2' '/usr/bin/env python'
     done
+
+    # needed for cross compilation
+    substituteInPlace ./chelper/__init__.py \
+      --replace 'GCC_CMD = "gcc"' 'GCC_CMD = "${stdenv.cc.targetPrefix}cc"'
   '';
 
   # NB: We don't move the main entry point into `/bin`, or even symlink it,