using the macro BUILD_APPLE_M1 set by configure prevents a PROPER universal build

[atncsj6h]

see
SDL-Hercules-390/hyperion#617

[atncsj6h]

another point you might want to consider is the cacheline size
a simple modification to hmalloc.h will take care of it

        #error Invalid cache line size specified
    #endif
#else

  #if defined( __APPLE__ ) && defined( __arm64 )
    #define CACHE_LINE_SIZE 128
  #else
    #define CACHE_LINE_SIZE 64
  #endif
  
#endif /* CACHE_LINE_SIZE */

[jmaynard]

Thank you, Enrico. I will make sure your fixes for this go in. Universal macOS builds are definitely a requirement.