cros-rust.eclass: Allow shlib-undefined for msan links

Match the setting in msan fuzzer config.

BUG=chromium:1129702
TEST=tryjob

Change-Id: If603d8bc116be587411ee525fea80c6ae48a1908
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2417762
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Bob Haarman <inglorion@chromium.org>
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
1 file changed