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.

llvm-svn: 110121
2 files changed
tree: 19d9c3990677af08757b8fad147027af296479a3
  1. clang/
  2. compiler-rt/
  3. libcxx/
  4. lldb/
  5. llvm/