The patch added in the reverted commit was meant to fix the issue
https://github.com/bmwcarit/meta-ros/issues/291



In fact it enables CMake to look for libraries in a host system which
leads to errors when a path is tested for a library presence with the
help of CMake's find_library() command: e.g. a non-existing host
directory is tested for library presence and find_library() returns
successfully because the library exists in bitbake's sysroot; then the
directory is used by the linker, but the library doesn't exist in the
directory -> failure. In worse cases the host directory may actually exist
and contain the library, but of wrong architecture, format or
incompatible ABI making finding the root cause a difficult task.

Signed-off-by: Dmitry Rozhkov <dmitry.rozhkov@linux.intel.com>