By normalizing the paths the path comparing code works correct
to generate the right RPATH even when there is a A/../A in TMPDIR
[YOCTO #3408]
(From OE-Core rev: 50327f2bba9f479dd209cdc54646b9d551e84c59)
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>