build.py: add preceedtask() API

The API is required by the revised rm_work.bbclass implementation,
which needs to know all tasks that do_build depends so that it
can properly inject itself between do_build and those tasks.

The new API primarily hides the internal implementation of the "after"
and "before" dependency tracking. Because tasks defined as
precondition via "recrdeptask" may or may not be relevant (they are for
rm_work.bclass), the API also includes support for that.

There's no default value for including recrdeptasks, so developers
have to think about what they need.

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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