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-ecdsa/python-ecdsa.hash

@@ -1,5 +1,5 @@
 # md5, sha256 from https://pypi.org/pypi/ecdsa/json
-md5	b1b33f7fe171eb1278de6f93eefc34f8  ecdsa-0.13.3.tar.gz
-sha256	163c80b064a763ea733870feb96f9dd9b92216cfcacd374837af18e4e8ec3d4d  ecdsa-0.13.3.tar.gz
+md5	821d543047941dd26f543f62912230d4  ecdsa-0.15.tar.gz
+sha256	8f12ac317f8a1318efa75757ef0a651abe12e51fc1af8838fb91079445227277  ecdsa-0.15.tar.gz
 # Locally computed sha256 checksums
 sha256	3eca9845773d2e5b8cc9d8c119d345f00a4806e4bd660d4a3d6cdf9c0e9d8bb2  LICENSE