Add compiler defenses flags

Add compiler defenses flags

It is essential to avoid buffer overflows and similar bugs as much as
possible.

According to Intel rules we are obligated to verify certain
compiler flags, so it will be much easier if they are added to the
Makefile.

Add gcc flags for prevention of buffer overflows, format string vulnerabilities,
stack protection to prevent stack overwrites and aslr enablement through -fPIE.
Also make the flags configurable.

The changes were verified on gcc versions 7.5, 8.3, 9.2, 10 and 12.2.

Signed-off-by: Mateusz Grzonka <mateusz.grzonka@intel.com>
Signed-off-by: Jes Sorensen <jes@trained-monkey.org>