sys-libs/ldb: Remove from portage-stable

Removes sys-libs/ldb from portage-stable in preparation for it to be
simultaneously added to chromiumos-overlay in a dependent CL. This
is to allow ldb to be patched against CVE-2020-27840 and
CVE-2021-20277.

BUG=chromium:1211782, chromium:1212460
TEST=emerge-nami ldb && emerge-nami samba, deploy to DUT, test that an
SMB share can be added and used

Cq-Depend: chromium:2921700
Change-Id: I9c380e21bd4fa7e1463222ec7be6ed8132dd12a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2921698
Reviewed-by: Anand K Mistry <amistry@chromium.org>
Reviewed-by: Allen Webb <allenwebb@google.com>
Reviewed-by: Sergey Frolov <sfrolov@google.com>
Tested-by: Josh Simmons <simmonsjosh@google.com>
Commit-Queue: Josh Simmons <simmonsjosh@google.com>
6 files changed