CoCo: Fix memory overflow bug and "macro redfined" warning

[EricCarrGH]

• Removed macro redefined warnings
• Reverted make block for mac. Not needed.
• Fix longstanding memory corruption bug, where CMOC writes a 16 bit enum value at an 8 bit location, overflowing to the next byte in memory. The following sample program illustrates the problem:

#include <coco.h>
#include "fujinet-fuji.h"

// First variable of program. It resides in the memory immediately following the fujinet-lib "ak_appkey_size" variable
char firstVar[] = "ABC";

int main(void)
{   
    // Prints: 41 42 43 : ABC
    printf("%02x %02x %02x : %s\n",firstVar[0], firstVar[1], firstVar[2], firstVar);
    
    fuji_set_appkey_details(0xffff, 0x1, DEFAULT);
    
    // Prints: 00 42 43 :     (without fix - first byte set to 0)
    // Prints: 41 42 43 : ABC (with fix)
    printf("%02x %02x %02x : %s\n",firstVar[0], firstVar[1], firstVar[2], firstVar);
    
    while (1);
}

[tschak909]

Thank you!