quickjs-libc: fix incompatible pointer error with gcc 14

[1480c1]

gcc 14 promoted -Wincompatible-pointer-types to an error and now shows

src/quickjs/quickjs-libc.c:3376:49: error: passing argument 2 of 'GetExitCodeProcess' from incompatible pointer type [-Wincompatible-pointer-types]
 3376 |                 GetExitCodeProcess(pi.hProcess, &ret);
      |                                                 ^~~~
      |                                                 |
      |                                                 int *

[rbouqueau]

Thank you. Actually the modified code was copied from quickjs so it would seem logical to also modify the upstream if not done already.

I checked and it seems quickjs is available and actively maintained on a git repository at https://github.com/bellard/quickjs/. Maybe GPAC could change the way it integrates quickjs?

[1480c1]

I believe that the changes here do not apply to upstream as they do not use GetExitCodeProcess(), and thus they don't encounter the same issue. Rather, it seems like these changes are due to the mentioned - added MSVC support for most 'os' functions (most importantly exec, waitpid and kill) feature specific to this version of quickjs