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deec78cdd3
GIT_WORK_TREE is an environment variable which tells git where the
worktree is. It may be set by the user or by git itself, e.g. when
running `git rebase -i --exec ...`. If it is set, it overrides the
working directory, causing the `git checkout` from FetchContent_Populate
to fail. Clear this variable.
Do the same for GIT_DIR for the same reason.
A way to reproduce the failure that this commit fixes is:
git rebase -i HEAD^^^ --exec 'ninja -C /path/to/build/dir fish'
prior to this commit, using the fetched PCRE2, this would fail in CMake.