remove perl from git-commit.sh

It is really annoying when the essentials do not work.
I think we could improve at  least them, by minimizing
their dependencies to external tools.

---

git-commit.sh has only ohne place where perl is used
and it can actually quite trivially be done in sh.
git-ls-files without "-z" produces quoted output, even if
is different from that produced by perl code it could be
enough. Otherwise I'd better suggest to add another
quoting style (replacing only \t, \n and backslash) than
having to constantly patch git-commit.sh for binmode
or perl path (Windows has no stable tool set, and perl
for instance often resides "somewhere").

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