build-unit-test-docker: Update googletest

The current version of googletest has a memory use-after-free. This
was noticed when using ub+asan on sdeventplus. This patch updates
googletest to a newer version which contains a fix for the bug.

Newer googletest got rid of the need for -DBUILD_G{TEST,MOCK} cmake
flags.

Change-Id: Ib60d7522f3c238c7e2719b824eb1ffa46884f30a
Signed-off-by: William A. Kennington III <wak@google.com>
1 file changed