Add options --force-manifest and --test-build to bisect.pl

Add options --force-manifest and --test-build to bisect.pl

--force-manifest touches any files in MANIFEST that are missing. This avoids
hanging on 5.004 or earlier (where Configure's stdin is a tty) when Configure
detects the missing files and asks you if you want to stop. It's also useful
on 5.005 or later if you don't want to treat missing files as a "skip".
--test-build changes behaviour to treat failing to build the target exectuable
as a "fail", instead of a "skip".