[CMake] subversion

[Nagger]

Am 24.06.2016 um 19:48 schrieb Andreas Naumann:

> At the moment, I check, if my directory is a working copy and if it is
> not, the version variable is not defined. In my oppinion, it would be
> better, if the macro from the subversion module would simply define a
> variable "is_working_directory" instead of failing hard.

See https://cmake.org/pipermail/cmake/2010-January/034862.html