Update to checkpolicy 2.2.  Requires libsepol 2.2.

Update to current upstream checkpolicy release.
Includes memory leak fixes, improved handling of
filename-based type transitions, and support for latest
kernel policy version.

Change-Id: Idabd3e4d50777c6691cb0d74b4e28f4fe06bef35
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>