Use relative path to generate .pyc files could remove build host
references which leads to non-reproducible builds.
(From OE-Core rev: 230890227304e27acd074a3c748812d7a603d511)
Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>