* Rebuilds packages when:
a) If you edit patches of a given recipe it will rebuild.
b) If you change a task like do_configure, things after it will rerun in
a given recipe.
c) If a dependent task in another recipe changes, it won't rerun.
d) If you change some global configuration variable or shared .bbclass
it will rebuild.
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>