Commit Briefs
add O_CLOEXEC (close-on-exec) to openat(2) calls
suggested by millert ok thomas_adam
add O_CLOEXEC (close-on-exec) flag to open(2) calls
suggested by millert ok thomas_adam
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)