build.py: Be determistic about a function's cwd

There is a subtle but nasty problem that a function's cwd can vary
depending on whether ${B} (often ${S}) exists before the funciton is
called or not. Most functions in the system can cope with this but
its bad practise and I've just witnessed build failures resulting
from this during image generation from bootimg.bbclass. I also
suspect this could explain some odd fetcher behaviour witnessed in
the past.

This change ensures we always call funcitons with a specific build
directory making things deterministic.

(Bitbake rev: ef0888f83fa4408eb768257d7e03700202faad18)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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