[crossfire] SVN revions in version

[Mark Wedel]

Alex Schultz wrote:

> Agreed with the reason below, but the problem with that, is that
> version.h shouldn't append "-r" unless it has a SVN_REV, and easier to
> check in defines if SVN_REV is defined at all, instead of checking if
> it's "" or not. Because of that, it seems like a better idea to me to
> leave the SVN_REV check as I suggested, not include svnversion.h in SVN,
> and make it just make an empty file if it doesn't have a revision.

  That would be fine.