test: move test_binary_{size,static_linking}.py to functional tests

The idea here is that these tests depend on the compilation step, and
thus test a production binary. This smells "integration" to me. The
actual reason for moving this however is so that we can have the `build`
group no longer depend on the shared compilation step.

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat