gobject-introspection: always DEPEND on gobject-introspection-native

gobject-introspection: always DEPEND on gobject-introspection-native

If a recipe inherits gobject-introspection then there's a good chance
that it needs the gobject-introspection-native recipe for the m4 macros
in introspection.m4, because we always autoreconf so we always need the
macros to be present.

Change the dependencies so that inheriting g-i always adds a dependency
on gobject-introspection-native, and a dependency on qemu-native and
target gobject-introspection if G-I is enabled.

Partially reverts 4e51c18.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>