Log Message:
go-module.mk: more sensible default for GO_BUILD_PATTERN

The previous default (...) means "build the whole world", which is never
what you want. Instead, use "./...", which means "everything below the
top-level directory". According to the documentation, this is what was
meant the whole time.

This is probably a no-op because any useful Go package overrides this
currently.

no objection from wiz@