libmakepkg: Add check_buildoption for distcc and ccache

makepkg used to check OPTIONS too, which could override
BUILDENV. Implement a new function that handles these
options more like OPTIONS.

This also reduces code duplication a bit.

Signed-off-by: Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

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