Copy stable/11@r303970 to releng/11.0 as part of the 11.0-RELEASE
cycle.

Prune svn:mergeinfo from the new branch, and rename it to RC1.

Update __FreeBSD_version.

Use the quarterly branch for the default FreeBSD.conf pkg(8) repo and
the dvd1.iso packages population.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFV r262756:

Import xz-embedded from git.

This is from commit hash '6a8a2364434763a033781f6b2a605ace9a021013'.

This makes it possible to use CRC64 but for now it's intentionally
not added to build.

Initial copy of xz-embedded to sys/contrib/.

The upcoming geom_compress module (a read-only gzip/ulzma translation layer,
similar to what geom_uzip does) will leverage parts of this.

Import xz-embedded from git.

This is from commit hash '48f4588342f4a4e0182a6740e25675fd8e6c6295'.