When there is a '..' in the rootdir path, rootdir will not be a substring of
fpath. This causes an incorrect rpath of the difference between the workdir
and the sysroot to be computed, which is incorrect. Normalizing basedir
fixes this issue.
(From OE-Core rev: 753cfcadd8cc683e69b6707b823dc49dfb34ab0b)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>