On unix building will automatically substitute the correct SVN Revision :D
(On windows it will just leave it as the default, so we should probably change this to something like -1 or so to make it obvious)
Nightly Build no longer tries to substitue RELEASE_DATE
git-svn-id: http://svn.dmdirc.com/trunk@361100569f92-eb28-0410-84fd-f71c24880f