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/fhandler_serial.cc

@@ -557,7 +557,7 @@ fhandler_serial::ioctl (unsigned int cmd, void *buf)
        break;
      }
 
-  termios_printf ("%d = ioctl (%p, %p)", res, cmd, buf);
+  termios_printf ("%d = ioctl(%p, %p)", res, cmd, buf);
 # undef ibuf
 # undef ipbuf
   return res;