app-shells/bash: fix CVE-2019-18276

Add backported patch for CVE-2019-18276.

BUG=b/269237737
TEST=presubmit
RELEASE_NOTE=Fixed CVE-2019-18276.

cos-patch: security-high
Change-Id: Ic5c5dc5faf4d06384df83ac40eb0559ccc87fa15
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/portage-stable/+/43765
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Main-Branch-Verified: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Vaibhav Rustagi <vaibhavrustagi@google.com>
3 files changed