cabextract: add utility to extract Microsft cabinet files

WoA firmware, fonts and some other useful files are being distributed as
a Microsoft cabinet files. Add recipes for the cabextract utility, which
is used to extract such files.

Cabextract can either use a bundled source tree for libmspack library or
an externally provided library. Package the library separately in order
to be able to share it with the meta-security layer.

Cc: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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