Faster Makefile (especially on multi-core)
Faster Makefile (especially on multi-core)

- The default `make` runs twice as fast.
- `make goinstall` is similarly 2x speed (also more idiomatic)
- Also cleaned it Make dependencies a bit to made them more reliable.

yacloud-io/teleport,sokoow/teleport,sokoow/teleport,gravitational/teleport,yacloud-io/teleport,yacloud-io/teleport,sokoow/teleport,gravitational/teleport,yacloud-io/teleport,yacloud-io/teleport,sokoow/teleport,yacloud-io/teleport,sokoow/teleport,sokoow/teleport,gravitational/teleport,gravitational/teleport,gravitational/teleport,yacloud-io/teleport,gravitational/teleport