MFC r263429

MFC r263429

Fix kern/187712: config(8) does not respect KERNCONFDIR.
The impact of this bug is that you cannot build a kernel if both of the
following are true:
1) The kernel config file is in a non-default location
2) The kernel config file uses the "include" statement from config(5).

usr.sbin/config/main.c
usr.sbin/config/config.8
usr.sbin/config/config.h
usr.sbin/config/lang.l
	Added a "-I path" option to config(8).  By analogy to cc(1), it adds
	an extra path in which the "include" statement will search for
	files.

Makefile.inc1
        Pass "-I ${KERNCONFDIR}" to config(8).

git-svn-id: svn://svn.freebsd.org/base/stable/10@264325 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f