main/busybox: cleanup xz symlink

xz has been disabled in 7767013f (Revert "main/busybox: enable xz applet",
2020-11-13). Make sure that the symlink is cleaned up as well.
7 jobs for !14713 with bb-cleanup-xz in 3 minutes and 50 seconds (queued for 3 seconds)
latest detached
Status Job ID Name Coverage
  Lint
failed #253583
docker-alpine x86_64 allowed to fail
lint

00:00:20

 
  Build
passed #253588
docker-alpine ci-build aarch64
build-aarch64

00:02:08

passed #253589
docker-alpine ci-build armv7
build-armv7

00:02:07

passed #253587
docker-alpine ci-build ppc64le
build-ppc64le

00:02:13

passed #253586
docker-alpine ci-build s390x
build-s390x

00:02:06

passed #253585
docker-alpine ci-build x86
build-x86

00:01:14

passed #253584
docker-alpine ci-build x86_64
build-x86_64

00:01:07

 
Name Stage Failure
failed
lint Lint
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