archiver: preserve sysroot paths in configured mode
do_ar_configured alters WORKDIR but also expects to be able to run do_configure,
so forcibly expand the paths to the sysroots as otherwise they'll point to a
non-existant directory in the temporary WORKDIR.
[ YOCTO #11584 ]
(From OE-Core rev:
aa2240657b015d46e9ba4bcb6264709a82313d83)
(From OE-Core rev:
cd5e6172525c7618e93d8255a1d6102a24496f53)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
