eglibc: fix packaging of some of nativesdk packages

eglibc: fix packaging of some of nativesdk packages

eglibc.inc contains packaging rules that depend on PKGSUFFIX expansion.
However that variable wasn't expanded properly in some case. E.g.

PACKAGES = " ... nscd${PKGSUFFIX} ..."
FILES_nscd${PKGSUFFIX} = "${sbindir}/nscd*"

would be expanded to

PACKAGES = " ... nscd-nativesdk ..."
FILES_nscd = "${sbindir}/nscd*"

Thus leading to empty -nativesdk packages and missing files. To overcome
that use python code blob to properly define PKGSUFFIX variable.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>