Add METALINK and PSL options

[sunpoet]

Summary

> Running Q/A tests (stage-qa)

Error: /usr/local/bin/wget is linked to /usr/local/lib/libmetalink.so.3 from misc/libmetalink but it is not declared as a dependency
Warning: you need LIB_DEPENDS+=libmetalink.so:misc/libmetalink
Error: /usr/local/bin/wget is linked to /usr/local/lib/libpsl.so.5 from dns/libpsl but it is not declared as a dependency
Warning: you need LIB_DEPENDS+=libpsl.so:dns/libpsl

[sunpoet]

I just noticed that vd@ is not available here when I tried to add him as a reviewer.

[sunpoet]

Committed in r426749.