viewvcs: handle non-UTF-8 commit message

Back in the old days, git didn't store commit encodings
and allowed messages in various encodings to enter history.
Assuming such a commit is UTF-8 trips up s/// operations
on buffers read with the `:utf8' PerlIO layer.  So clear
Perl's internal UTF-8 flag if we end up with something
which isn't valid UTF-8

An example is commit 7eb93c89651c47c8095d476251f2e4314656b292
in git.git ([PATCH] Simplify git script, 2005-09-07)

0 files changed, 0 insertions, 0 deletions