heimdal: Version bumped to 1.5.3

- Changed AFS transarc paths to proper openafs paths in lunar
- Applied a texi patch that fix issues with newer versions of texinfo
- Fix enctypes for kerberos to work properly with openafs >= 1.6.5
  that use rxkad.keytabs (stronger encryption algorithms)
heimdal: Removed unnecessary exit 1 calls
Merge remote-tracking branch 'ratler/heimdal'
heimdal: fix comment