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/security.cc

@@ -968,7 +968,7 @@ set_file_attribute (HANDLE handle, path_conv &pc,
     }
   else
     ret = 0;
-  syscall_printf ("%d = set_file_attribute (%S, %d, %d, %p)",
+  syscall_printf ("%d = set_file_attribute(%S, %d, %d, %p)",
 		  ret, pc.get_nt_native_path (), uid, gid, attribute);
   return ret;
 }