testing/newlib: add aarch64-none-elf target

fix pkgdesc
7 jobs for !17359 with cross-embedded-aarch64-none-elf in 406 minutes and 23 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
failed #302741
docker-alpine x86_64 allowed to fail
lint

00:00:19

 
  Build
failed #302746
docker-alpine ci-build aarch64
build-aarch64

06:45:31

failed #302747
docker-alpine ci-build armv7
build-armv7

06:30:09

failed #302745
docker-alpine ci-build ppc64le
build-ppc64le

06:36:08

passed #302744
docker-alpine ci-build s390x
build-s390x

01:03:43

failed #302743
docker-alpine ci-build x86
build-x86

03:39:53

failed #302742
docker-alpine ci-build x86_64
build-x86_64

02:58:57

 
Name Stage Failure
failed
build-x86_64 Build
No job log
failed
lint Lint
No job log
failed
build-ppc64le Build
No job log
failed
build-aarch64 Build
No job log
failed
build-x86 Build
No job log
failed
build-armv7 Build
No job log