Go packages now define a set of files to buildlink in their buildlink3.mk.
go-packages.mk no longer looks in ${PREFIX}/gopkg during the build. This
should also fix the spurious issues with rebuilds of .a files during bulk
builds of Go packages.
It turns out that [^a]* matches all files not beginning with a on Darwin
and all files beginning with a on NetBSD. Work around this by crafting
a for loop with a case expression.
