[oe] RFC: allow subdir for SRC_URI entries

[Robert Schuster]

Hi folks,
I desperately need this patch. ;)

It allows one to specify ";subdir=<DIR>" in SRC_URI entries. Having the
effect that the respective file is either unpacked or copied into that
very directory which is treated as:

${WORKDIR}/<DIR>

It is not really ${WORKDIR} but the cwd when do_unpack is run. In most
cases this is ${WORKDIR}. If it is something else the recipe writer will
have a reason for that.

With this patch we can finally deal easily with tarbombs.

Regards
Robert
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