Do not install files in usr/share/ when MKSHARE=no

ok christos@

branches: 1.2.2; 1.2.6; 1.2.12;
Include bsd.prog.mk to ensure that make includes actually works.

Re-do using bsd.files.mk

Rebase to HEAD as of a few days ago.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs. ("Protocol error: too many arguments")

Sync with HEAD

file Makefile was added on branch bouyer-quota2 on 2011-03-05 15:08:34 +0000