run-make wasm tests cannot be run

[ehuss]

I am unable to run the wasm tests in src/test/run-make. It looks like the wasm32-unknown Travis image is no longer running them, either. Reverting some of the changes in #50000 brings them back (but causes the cross-lang-lto test to fail).

I'm not very familiar with the bootstrap code, so I'm uncertain how this should be fixed.

cc @alexcrichton @michaelwoerister

[alexcrichton]

Oh oops, sorry I should have caught this in review!

I think the fix is:

• Move cross-lang-lto from run-make to run-make-fulldeps
• Change the RunMake test suite back to default_test! from its current host_test!

@ehuss or @michaelwoerister, would y'all be able to submit a PR with that?

[ehuss]

I can give it a shot.