types.nix: Add ‘either’ type

(cherry picked from commit f932910323bf7188f70c49789ce85392c36e06b4)
man-pages: Update to 3.70

(cherry picked from commit c37057240fa89339f570043b0ade28fe4517de5a)
linux: Enable ACLs in ext3

http://hydra.nixos.org/build/13462892
(cherry picked from commit e4752d7877e4adcca25ca6228f1d36b58a83e8a5)
Don't barf if /var/log doesn't support ACLs

http://hydra.nixos.org/build/13462892
(cherry picked from commit 7c4591d010ad827f9927ce84b2e1bd2db8762f92)
man-pages: Update to 3.71.

(cherry picked from commit f61fb466eb09c4c7432d29838b752d5285163388)