enter_chroot: drop C.UTF-8 check

Our glibc supports this locale now, so we don't have to hack it.

BUG=b:187791203
TEST=CQ passes

Change-Id: I3c71fc5221e29ff2b9b0fb91fbaeb0ffbabae70d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/3253905
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
1 file changed