Compilation error on GCC 12.2.0 (cross compile to arm)

[cscd98]

src/emu/validity.c: At global scope:
src/emu/validity.c:33:57: warning: narrowing conversion of ‘-3’ from ‘int’ to ‘unsigned int’ is ill-formed in C++11 [-Wnarrowing]
   33 | UINT8 your_ptr64_flag_is_wrong[(int)(sizeof(void *) - 7)];
      |                                                         ^
src/emu/validity.c:33:32: error: size ‘-3’ of array ‘your_ptr64_flag_is_wrong’ is negative
   33 | UINT8 your_ptr64_flag_is_wrong[(int)(sizeof(void *) - 7)];
      |                                ^~~~~~~~~~~~~~~~~~~~~~~~~