external-sourcery-toolchain: avoid conflict with util-linux

Remove bits which are also being provided by package util-linux
to resolve build warnings.

Signed-off-by: Yasir-Khan <yasir_khan@mentor.com>
external-sourcery-toolchain: skip unpackaged warnings

Correctly skip the build warnings for unpackaged files.

Signed-off-by: Yasir-Khan <yasir_khan@mentor.com>
Merge pull request #46 from Yasir-Khan/external-toolchain

external-sourcery-toolchain: resolve build warnings