glib-2.0: fix host path appearing in gsocketclient-slow test script
Glib's build looks for the 'env' binary and embeds that path into the test
script, but thanks to hosttools this is /path/to/tmpdir/hosttools/env.
Fix this by hardcoding the path to env in the cross file.
Also as the cross file is only used in target builds only add it to SRC_URI for
target builds, so that changes to the cross file don't cause a rebuild of
glib-2.0-native.
Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
