Change Details

mono is used by databases/foundationdb during build only, and mono is a hefty runtime dependency that is unneeded. Teach mono to accept `USES= mono:build` to enable shipping a leaner foundationdb. PHB needs updating when I figure out how to do that in a separate diff.

mono is used by databases/foundationdb during build only, and mono is a hefty runtime dependency that is unneeded. mono:build is added in a separate devision

mono is used by databases/foundationdb during build only, and mono is a hefty runtime dependency that is unneeded. Teach mono to accept:build is `USES= mono:build` to enable shipping a leaner foundationdb. PHB needs updating when I figure out how to do that in a separate diff.added in a separate devision