Update security compiler flags

ossf maintains a list of best practice compiler flags for hardened
services[1] implement them.

Tested: Unit tests pass.  No code changes.

[1] https://github.com/ossf/wg-best-practices-os-developers/blob/main/docs/Compiler-Hardening-Guides/Compiler-Options-Hardening-Guide-for-C-and-C%2B%2B.md

Change-Id: I0c83c30aa2d80317d9e016544d736a60ad894806
Signed-off-by: Ed Tanous <etanous@nvidia.com>