Commit Briefs
got_error_from_errno -> got_error_prefix_errno
also add got_error_prefix_errno2 and got_error_prefix_errno3 which should hopefully all be merged into a single function with variadic args (but can't alloc mem)
revert eb73a30f7effc51c1cfee2864102635e3659f87a
Not waiting for children can make us blow the fork() ulimit with lingering zombies; the Ctrl-C issue will need some other fix.