Add missing imports
Merge pull request #2410 from 9rnsr/fix_imports

Add missing imports
Remove unused test in std.process

This seems like a remnant from when the first version of std.process was
being developed.  It does not appear to be in use today, so there is no
reason to keep it around.
Merge pull request #2414 from kyllingstad/remove-std-process-maintest

Remove unused test in std.process