Bump buildroot to 2020.11-rc1 (#985)

* Update buildroot-patches for 2020.11-rc1 buildroot

* Update buildroot to 2020.11-rc1

Signed-off-by: Stefan Agner <stefan@agner.ch>

* Don't rely on sfdisk --list-free output

The --list-free (-F) argument does not allow machine readable mode. And
it seems that the output format changes over time (different spacing,
using size postfixes instead of raw blocks).

Use sfdisk json output and calculate free partition space ourselfs. This
works for 2.35 and 2.36 and is more robust since we rely on output which
is meant for scripts to parse.

* Migrate defconfigs for Buildroot 2020.11-rc1

In particular, rename BR2_TARGET_UBOOT_BOOT_SCRIPT(_SOURCE) to
BR2_PACKAGE_HOST_UBOOT_TOOLS_BOOT_SCRIPT(_SOURCE).

* Rebase/remove systemd patches for systemd 246

* Drop apparmor/libapparmor from buildroot-external

* hassos-persists: use /run as directory for lockfiles

The U-Boot tools use /var/lock by default which is not created any more
by systemd by default (it is under tmpfiles legacy.conf, which we no
longer install).

* Disable systemd-update-done.service

The service is not suited for pure read-only systems. In particular the
service needs to be able to write a file in /etc and /var. Remove the
service. Note: This is a static service and cannot be removed using
systemd-preset.

* Disable apparmor.service for now

The service loads all default profiles. Some might actually cause
problems. E.g. the profile for ping seems not to match our setup for
/etc/resolv.conf:
[85503.634653] audit: type=1400 audit(1605286002.684:236): apparmor="DENIED" operation="open" profile="ping" name="/run/resolv.conf" pid=27585 comm="ping" requested_mask="r" denied_mask="r" fsuid=0 ouid=0

buildroot/package/python-lxml/python-lxml.hash

@@ -1,5 +1,5 @@
 # Locally computed
-sha256  c81cb40bff373ab7a7446d6bbca0190bccc5be3448b47b51d729e37799bb5692  lxml-4.4.1.tar.gz
+sha256  27ee0faf8077c7c1a589573b1450743011117f1aa1a91d5ae776bbc5ca6070f2  lxml-4.5.1.tar.gz
 sha256  41d49dd406aa0e1548a6d5f21a30d6bf638b3cd96eb7289dd348d83ed2e40392  LICENSES.txt
 sha256  69edb445c1335a8312d4c09271847e9956d84f0d9f724d125340cc3fad767b2a  doc/licenses/BSD.txt
 sha256  0497ae8138811ef4466ede653bab7a59feb3d3c14f9ed50fc33a00aeb5bec32e  doc/licenses/elementtree.txt