Use the RPM support detection code from f8a2d09e in master.

*sigh* It looks like in the conversion from svn to git the changes to
FindLibArchive.cmake in SVN r1209188 which defined LIBARCHIVE_VERSION
were did not make it to git.

This means the version check always failed and Ark always thought
libarchive did not have RPM support...

CCBUG: 60942