FMUComplianceChecker stops compiling on recent macOS / xcode with clang 12

[RobertHilbrich]

Hi,
the reason for the failing build is that FMIL no longer compiles, because its thirdparty dependency minizip no longer compiles with clang 12.
I opened an issue at the FMIL Repository - see here. If those guys fix their 3rd party dependency code to work with clang 12, you will probably need to fix your CMake build config to pull the most recent version of FMIL - instead of 2.0.x.