Commit Briefs
Replace fgetln() with getline()
getline() is, per the latter's OpenBSD man page, safer and more portable than fgetln().
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)