worker swiftc actions are missing standard error

[jerrymarino]

When I hit an error in a swift compiler action, standard error is gone.

FWIW: to help narrow this down, I have fixed the bug by reverting:
#633
and
#634

[brentleyjones]

Thanks. I'll see what I messed up there.

[jerrymarino]

@brentleyjones ah thanks for looking into it! For now, I've just reverted these in the fork really looking forward to the new feature though 👍

[brentleyjones]

Fixed by #642.

[jerrymarino]

@brentleyjones thanks for the quick fix ❤️ ! I'm going to test this out a bit this morning on rules_ios as well