Add LOCAL_ITOOLS so tools can be appended to ITOOLS if need be

This enables groups that modify some files to include more tools in the
ITOOLS set when running make distributeworld, etc as some commands which
are run might require additional TOOLS outside the base distribution defined
set

Sponsored-by: EMC Isilon
Submitted-by: Russell Cattelan <russell.cattelan@isilon.com>
Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Merge branch 'atf-tools-regression-convert' of github.com:yaneurabeya/freebsd into atf-tools-regression-convert
Add NO_STATIC support so only shared libraries can be installed if requested

Sponsored-by: EMC Isilon
Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
Merge branch 'atf-tools-regression-convert' of github.com:yaneurabeya/freebsd into atf-tools-regression-convert