MFC r340127,340133,355085: libbsdxml (expat) 2.2.9.

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 r302260: expat 2.2.0

Approved by: re (kib)

Update base system libexpat to 2.1.0.

MFC after: 3 days

Clean some 'svn:executable' properties in the tree.

Submitted by: Christoph Mallon
MFC after: 3 days

This commit was generated by cvs2svn to compensate for changes in r178848,
which included commits to RCS files with non-trunk default branches.

This commit was generated by cvs2svn to compensate for changes in r104349,
which included commits to RCS files with non-trunk default branches.