make_first really means the same, as the default target is 'first'
which immediately invokes make_first.
as a nice side effect, this fixes ALL_DEPS not being used by the subdirs
template's default target - make_default wasn't special-cased in the
right place, while make_first is.
Change-Id: I946cea3b2dae198eda61d31dbd19c6ccd15deac7
Reviewed-by: Marius Storm-Olsen <marius.storm-olsen@nokia.com>