Replace all strerror calls with wrapper.

All string_utf8(strerror(x)) calls are replaced with
errno_to_str(x).

* sysif.c (errno_to_str): New function.
(strerror_wrap): Now implemented via call to errno_to_str.
(mkdir_wrap, ensure_dir, chdir_wrap, getcwd_wrap, rmdir_wrap,
mknod_wrap, mkfifo_wrap, chmod_wrap, do_chown, symlink_wrap,
link_wrap, readlink_wrap, close_wrap, exec_wrap, stat_impl,
do_utimes, pipe_wrap, poll_wrap, getgroups_wrap, setuid_wrap,
seteuid_wrap, setgid_wrap, setegid_wrap, setgroups_wrap,
getresuid_wrap, getresgid_wrap, setresuid_wrap,
setresgid_wrap, crypt_wrap, uname_wrap): Use errno_to_str.

* sysif.h (errno_to_str): Declared.

* ftw.c (ftw_wrap): Use errno_to_str.

* socket.c (dgram_get_byte_callback, dgram_flush, sock_bind,
open_sockfd, sock_connect, sock_listen, sock_accept,
sock_shutdown, sock_timeout, socketpair_wrap): Likewise.

* stream.c (errno_to_string): Likewise, and don't handle
zero case any more; pass down to errno_to_str.
(stdio_close, pipe_close open_directory, open_file,
open_fileno, open_tail, fds_subst, open_command,
open_subprocess, run, remove_path, rename_path): Use
errno_to_str.

* termios.c (tcgetattr_wrap, tcsetattr_wrap, tcsetattr_wrap,
tcsendbreak_wrap, tcdrain_wrap, tcflush_wrap, tcflow_wrap):
Likewise.

diff --git a/termios.c b/termios.c

1 files changed, 1 insertions, 1 deletions

diff --git a/ftw.c b/ftw.c
index 9e066754..99178961 100644
--- a/ftw.c
+++ b/ftw.c
@@ -126,7 +126,7 @@ val ftw_wrap(val dirpath, val fn, val flags_in, val nopenfd_in)
       {
         int eno = errno;
         uw_throwf(errno_to_file_error(eno), lit("ftw ~a: ~d/~s"),
-                  dirpath, num(eno), string_utf8(strerror(eno)), nao);
+                  dirpath, num(eno), errno_to_str(eno), nao);
       }
     default:
       return num(res);