NOB_PRINTF_FORMAT "-Wformat" warnings with MinGW

[KillerxDBr]

Avoid warnings when using %zu with printf style nob functions with MinGW gcc compiler, tested with gcc and clang

nob.c: In function 'main':
nob.c:6:43: warning: unknown conversion type character 'z' in format [-Wformat=]
    6 |         nob_log(NOB_INFO, "sizeof(int) = %zu", sizeof(int));
      |                                           ^
nob.c:6:27: warning: too many arguments for format [-Wformat-extra-args]
    6 |         nob_log(NOB_INFO, "sizeof(int) = %zu", sizeof(int));
      |                           ^~~~~~~~~~~~~~~~~~~

[rexim]

Thanks! Committed in 6c5a74d