CMake: add version control info to PACKAGE_VERSION, if available.

Adds "svn" or "git", depending on the VCS used. If svn, adds the
revision number as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110121 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed