Update to checkpolicy 2.4.

Update to current upstream checkpolicy release.
Includes a variety of bug and memory leak fixes, performance
optimizations for neverallow checking, and improved error
reporting.

Depends on libsepol 2.4.

Change-Id: If08ba195e156dd23bc07e2005d803abbed4a90bc
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
12 files changed