We don't want references including shell parameter expansion modifiers
(i.e. `:-`, `#`, `%%`, etc) to be added to our vardeps, so add a test to
ensure this.
YOCTO #12987
(Bitbake rev: be022085fe1ea1b9a9d519f0455883e2da363d2c)
Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>