A little overlay for unixODBC

According this forum thread, with these addition unixODBC on 64bit linux will be able to connect oracle databases.

Copy paste how to: mkdir -p /usr/local/portage

# clone the GIT repository
git clone git://github.com/bonyiii/unixODBC.git /usr/local/portage

# add the overlay to your make.conf
cat >> /etc/make.conf <<\EOF
PORTDIR_OVERLAY="${PORTDIR_OVERLAY} /usr/local/portage"
EOF

# install unixODBC
emerge -av unixODBC