Throughout, remove extra space after function name from debugging output.

Throughout, change syscalls to report on return values using new %R format
option.
* smallprint.cc (__small_vsprintf): Add parsing for %R to report on return
values and possible errno from syscalls.
* errno.cc (errmap): Add PRIVILEGE_NOT_HELD.
* fhandler_tty.cc (fhandler_pty_master::setup): When creating a thread use
shorter name to reduce debuggging output.
* select.cc (start_thread_pipe): Ditto.
(start_thread_serial): Ditto.
(start_thread_socket): Ditto.
(start_thread_mailslot): Ditto.
* sigproc.cc (talktome): Ditto.

winsup/cygwin/sec_auth.cc

@@ -169,7 +169,7 @@ cygwin_logon_user (const struct passwd *pw, const char *password)
 	hToken = INVALID_HANDLE_VALUE;
     }
   cygheap->user.reimpersonate ();
-  debug_printf ("%d = logon_user(%s,...)", hToken, pw->pw_name);
+  debug_printf ("%R = logon_user(%s,...)", hToken, pw->pw_name);
   return hToken;
 }