get_arch_userspace: dereference /bin/sh

Rather than rely on coreutils (and whatever weirdness it might try),
poke at /bin/sh.  That's a pretty reliable path for always existing.

BUG=chromium:392021
TEST=`cbuildbot x86-generic-full` passes

Change-Id: Id2ae24626bb038f294b20f74299c1b12a1db195a
Reviewed-on: https://chromium-review.googlesource.com/212208
Reviewed-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed