https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1012766
> Whilst working on the Reproducible Builds effort [0] we noticed that
> rtpengine could not be built reproducibly.
>
> Whilst it did use the value from debian/changelog, the RELEASE_DATE
> variable changed due to underlying system timezone setting. A patch
> is attached that passes -u/--utc to the call to date(1).
>
> [0] https://reproducible-builds.org/
If the CFLAGS already contain -O0, skip adding the hardening flags, as
they force inclusion of -O2
Change-Id: I12ab0a61fff169954c73f3a714e563234c841483
also eliminate `` in makefiles
document external bcg729 requirement for Debian building
closes#460
Change-Id: Iadecbc6df81c2fe876acc20c25c8be0e85391779