kdesrc-build: fix libgpg-error local change detector
Testing a patch for kdesrc-build's "there's a local change that needs to be git-stashed first" logic.
It works for most modules but libgpg-error creates build artifacts that aren't actually different, so
git-diff says that there's no changes, but
git-rebase still thinks that there are changes.
git-status gives a better representation of what
git-rebase will later think.