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

Clean up the types used in <machine/ucontext.h> on arm64. As some ports
include this file without first including the headers needed for uint32_t
and the like use the __foo type.

Obtained from: ABT Systems Ltd
Sponsored by: The FreeBSD Foundation

Add space for future expansion [1]. While here clean up a little, spsr is
only 32-bits, and mark the holes in the struct with a pad member.

Suggested by: kib [1]
Sponsored by: The FreeBSD Foundation

Add the start of the arm64 machine headers. This is the subset needed to
start getting userland libraries building.

Reviewed by: imp
Sponsored by: The FreeBSD Foundation