Compilation fails with gnu on Mac processor

[arporter]

The C code contains some inline assembler that fails to compile on a Mac M4 processor. We need to decide whether that code is needed and so either remove it or protect it with a preprocessor macro.

[nmnobre]

We need to decide whether that code is needed and so either remove it or protect it with a preprocessor macro.

Though said code is indeed unused, @haanah-codes chose to preserve it and fence it with a preprocessor directive.