setup: prepare for more detailed "dubious ownership" messages

When verifying the ownership of the Git directory, we sometimes would
like to say a bit more about it, e.g. when using a platform-dependent
code path (think: Windows has the permission model that is so different
from Unix'), but only when it is a appropriate to actually say
something.

To allow for that, collect that information and hand it back to the
caller (whose responsibility it is to show it or not).

Note: We do not actually fill in any platform-dependent information yet,
this commit just adds the infrastructure to be able to do so.

Based-on-an-idea-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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