Port r6092: Clear unreliable libs from the cache during BDA clean builds.  #1309.
Port r6092: Clear unreliable libs from the cache during BDA clean builds.  #1309.

This is an imperfect solution -- it would be better to use an option like PSC dist release check -- but that process is too manual for BDA.

git-svn-id: 4b387fe5ada7764508e2ca96c335714e4c1692c6@6099 0d517254-b314-0410-acde-c619094fa49f

NUBIC/psc-mirror,NUBIC/psc-mirror,NUBIC/psc-mirror,NUBIC/psc-mirror