META_MODE/DIRDEPS_BUILD: Fix various issues with crunch builds.

• DIRDEPS_BUILD: Fix crunchgen builds losing their library dependencies on a nop-rebuild.
• META_MODE: Fix not rebuilding various crunch.mk targets if their .meta files warrant a rebuild. They were lacking .meta files previously. This adds .NOMETA to the crunch objects being used since they are already built. Bmake was forcing a rebuild on them since their .meta files were not in the expected place; there is no reason to rebuild them.

MFC after: 2 weeks
Sponsored by: EMC / Isilon Storage Division