Allow setting absolute paths for CMAKE_INSTALL_BINDIR

Podhorszki, Norbertrequested to merge
github/fork/franzpoeschel/fix-absolute-bin-dir into master

Created by: franzpoeschel

By default, Cmake will set the CMAKE_INSTALL_BINDIR variable to "bin", denoting a path within CMAKE_INSTALL_PREFIX. It may also be an absolute path which is currently not considered in the post-install scripts. This PR allows using absolute paths, too.

Merge request reports