[pybsddb] Patch for detecting BSDDB in Homebrew

[Matthew Peveler]

Hello,

Please see attached for patch for having pybsddb to detect BSDDB that's
been installed via Homebrew on Mac OS X. Homebrew will stick the berkeley
db files in /usr/local/opt/berkeley-db@# directory with a link then from
/usr/local/opt/berkeley-db to that above directory (where the # is the
major version), depending on what version you're installing. Installing
berkeley-db at 6 will create both directories while berkeley-db at 4 will only
create the former folder by default and require the '--force' flag to
create the latter.

As such, this patch makes pybsddb look for /usr/local/opt/berkeley-db
first, but then fall back to looking for the major version directories
(/usr/local/opt/berkeley-db@#) if that link doesn't exist.

Regards,
Matthew Peveler
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