kbuild: Build modules by default

kbuild: Build modules by default

So here we are: make vmlinux/bzImage/whatever will now also build
modules as it goes. Other than that, everything works as usual.
"make modules" builds only the modules (but you shouldn't need
it anymore). If you don't want the modules built, you can
do "make KBUILD_MODULES= vmlinux/whatever" to only compile built-in
objects.

If people want it, I can also allow for "make vmlinux/whatever nomodules"
to do the same.

Also, add '  ' in Rules.make to properly align output in quiet mode.