Remove compiler:features from USES=, too
Update to 3.6.0.
Needs EGGINFO for other ports to import

PR:		192096
Submitted by:	Kris Moore
Allow staging as a regular user
- Allow staging as a regular user
- Bump portrevision as files were not packaged with intended owner
Add BUILD_DEPENDS to make sure that the referenced thunderbird or
firefox port is rebuilt first, so that the -i18n ports can actually
build if the firefox/thunderbird port has become unusable through,
for instance, lang/gcc version upgrades that "lose" the libstdc++
from the recorded RPATH.