update xonsh APKBUILD

1) removed bytecode and eggs from package (export PYTHONPYCACHEPREFIX="$HOME/.cache/pycache/" if you need .pyc boost)
2) restored licence, it is not a bsd2 but a bsd2 with personalizzation at the end:
  "...The views and conclusions contained in the software and documentation are those of the
   authors and should not be interpreted as representing official policies, either expressed
   or implied, of the stakeholders of the xonsh project or the employers of xonsh developers."
7 jobs for !19662 with xonsh in 2 minutes and 42 seconds
latest detached
Status Job ID Name Coverage
  Lint
failed #353831
docker-alpine x86_64 allowed to fail
lint

00:00:18

 
  Build
passed #353836
docker-alpine ci-build aarch64
build-aarch64

00:01:12

passed #353837
docker-alpine ci-build armv7
build-armv7

00:01:15

passed #353835
docker-alpine ci-build ppc64le
build-ppc64le

00:01:58

passed #353834
docker-alpine ci-build s390x
build-s390x

00:00:50

passed #353833
docker-alpine ci-build x86
build-x86

00:00:53

passed #353832
docker-alpine ci-build x86_64
build-x86_64

00:00:39

 
Name Stage Failure
failed
lint Lint
No job log