defflag for MODULAR option

[Alan Barrett <apb%cequrux.com@localhost>]

I have patches to add "defflag MODULAR" to src/sys/conf/files
and to add #include "opt_modular.h" to everything that tests
the MODULAR option.  A test build on i386 works.

The patc is at
<ftp://ftp.netbsd.org/pub/NetBSD/misc/apb/defflag-modular.20090118.diff>

Is it OK in principle to commit this?

Before I commit, are there guidelines for how to sort defflag lines in
sys/conf/files, and how to sort #include "opt_foo.h" lines in various
kernel sources?

--apb (Alan Barrett)