creduce-git has its own topformflat so no longer depends on delta
creduce needed a patch to be backported with I got directly from
git. It seems quite a lot of work has happened recently so the
latest release is quite out of date now.
1. Drop dependency on delta, internal clang_delta now used.
2. Add dependency of clang since clang-format is used at runtime.
3. Only sed #!${MINGW_PREFIX} -> #!/usr, not the other one(s).
