Log Message:
Depend on foolscap >= 0.6.3.

This isn't strictly true; foolscap needs to be >= 0.6.3 if Twisted is
> 10, but it's easier to just require it than invent new compound
dependencies.

PKGREVISION++, because tahoe-lafs built with Twisted > 10 and foolscap
0.6.1 (from today or earlier in pkgsrc) fails to work.