MacOSX: Support building Certifier Framework (library and Certifier tests) on Mac/OSX.

[gapisback]

The Certifier Framework code base only partially builds on MacOSX. This requires that the right versions of Google protocol buffers, protoc, and other libraries be installed on Mac.

Currently, on /main, using Cellar/protobuf@3/3.20.3 version of protobuf, we get some ways in the build, but then fails as shown below [1].

Under this issue, resolve all s/w components' version-levels needed to build-and-test Certifier code base on Mac.

[1] Build failure:

compiling certifier_proofs.cc
g++ -I ../include -I/usr/local/opt/[email protected]/include/ -I ./sev-snp -g -Wall -std=c++11 -Wno-unused-variable -D X64 -Wno-deprecated-declarations -O3 -D SEV_SNP  -o ./certifier_proofs.o -c certifier_proofs.cc
In file included from certifier_proofs.cc:23:
./sev-snp/attestation.h:7:12: fatal error: 'linux/types.h' file not found
#  include <linux/types.h>
           ^~~~~~~~~~~~~~~
1 error generated.
make: *** [certifier_proofs.o] Error 1

[gapisback]

9/25/2024: Revisited w/ team and new members who joined the CFCC monthly meeting.

No immediate push for this MacOSX platform, but will be nice to have this working so it saves new users the extra effort / cost of deploying a Linux env somewhere else on the Cloud.