Remove upstreamed patch.
Remove HOST_CONFIGURE_VARS. These are not needed any more.
ac_cv_search_setfilecon was removed completely and the others are guarded
by if test "$with_selinux" != no; then now.
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/24572
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>