FreeRDP/FreeRDP — pull request #701 by floppym (2012-08-15 04:31:38+00:00)
Title: Allow CMAKE_INSTALL_LIBDIR to be an absolute path

On Gentoo Linux, CMAKE_INSTALL_LIBDIR is passed as an absolute path,
which caused plugins to be installed in /usr/usr/lib/freerdp.

The new logic better emulates the behavior of the real GNUInstallDirs module.