[CONTRIB] hook script check-needs-lock-on-binaries.pl

Hi there,

Please find attached a pre-commit hook script that can go into the
contrib directory. It will check that binary files that are listed in
"svnlook changed" (except deleted files) have the svn:needs-lock
property set. There are several scripts on the net that serve the same
purpose, but they only run on Windows. I couldn't find one that would
run on Linux, so I changed a few lines in svn-keyword-check.pl to make
it do what I need it to. This is the result.

Best regards,
Bastiaan Veelo.