Log Message:
Fix the interpreter to mtn-cleanup by introducing a run-time dependency on
perl.  I'm not sure there is a better way to fix this since mtn-cleanup is
installed into ${PREFIX}/bin/.

Also skip the interpreter check for some helper files that are not used by
default.  These may be put in separate packages but we can do this later;
for now I'm just adding a comment mentioning the idea.

Bump PKGREVISION to 2.