Fallback to VCS.release_date on VCS::NotFoundError

when -q is given.

One of the RubyCI servers, freebsd12, had a broken git environment:

```
$ git show
fatal: detected dubious ownership in repository at '/usr/home/chkbuild/chkbuild/tmp/build/20220917T123002Z/ruby'
To add an exception for this directory, call:

        git config --global --add safe.directory /usr/home/chkbuild/chkbuild/tmp/build/20220917T123002Z/ruby
```

tool/lib/vcs.rb doesn't work normally for that server.
Even for such cases, we'd like to generate a usable revision.h.

So this patch lets revision.h fallback to default VCS.release_date
when VCS::NotFoundError is raised.

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