When the metadata cache contains a negative EAPI, it means

When the metadata cache contains a negative EAPI, it means
that the cache entry was generated by a version of portage
that did not support the eapi. When the user upgrades to a
version that now supports the previously unsupported EAPI,
those cache entries need to be regenerated. Therefore,
when a cache entry has a negative EAPI, check if the EAPI
would be supported and trigger a regen if appropriate.
(trunk r7910 and r7919)

svn path=/main/branches/2.1.2/; revision=7933