leafnode: update to 1.11.11.

Updated provided by Michael B辰uerle via pkgsrc-wip.

* 1.11.11, 2015-08-25

### BUGFIXES
- The configfile parser now strips whitespace between a configuration
  parameter's value and a trailing comment. Found by Cecil Westerhof.
- The roff manual page sources now render proper hyphens (-), minus characters
  (\-) and en-dashes (\[en]) depending on their context. This is so that
  copying-and-pasting from the manual page works properly.
- The code that checks if the peer is local now properly deals with IPv4
  mapped IPv6 addresses.

(wiz)