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/errno.cc

@@ -156,6 +156,7 @@ static NO_COPY struct
   X (WAIT_NO_CHILDREN,		ECHILD),
   X (WORKING_SET_QUOTA,		EAGAIN),
   X (WRITE_PROTECT,		EROFS),
+  X (PRIVILEGE_NOT_HELD,	EPERM),
   { 0, NULL, 0}
 };