Update to 2.10.11 and fix the build with the ncurses port.

Submitted by:	Matthias Apitz <guru@unixarea.de> (ncurses fix)
One last cleanup, factorize a few things into variables, add a few entries to
PLIST_SUB and SUB_LIST, finish making sure the MANPATH are valid all around.

Differential Revision:	https://reviews.freebsd.org/D1254
Sponsored by:	Absolight
Update to 2.10.11 and fix the build with the ncurses port.

Submitted by:   Matthias Apitz <guru@unixarea.de> (ncurses fix)