Don't preserve previously installed /etc/altlinux-release:
we are keep BUILD_ID in /etc/os-release now, it is enough.

And require alt-os-release filetrigger.

- alternatives priorities changed

# Conflicts:
#	Makefile.in

# Conflicts:
#	branding.spec

It was menu for old Simply Linux and doesn't related to MATE.

(cherry picked from commit cc5af09359502ec1a5f37a6a130a4e696a8c9d1e)

It was copy/pasted from Simply Linux branding and it definetly
doesn't make sense here.

(cherry picked from commit 85fa2d5fe52cea61e6cf730b1eab027de339138f)

We use MATE only in the workstation.

# Conflicts:
#	branding.spec

License can't be changed after update the package from a
repository, so don't change these files.
Install these files in %post and own them as
%ghost %config(noteplace). It this way they are will remain
even if the package will be removed.