Function igGetAllocatorFunctions
pub unsafe extern "C" fn igGetAllocatorFunctions(
p_alloc_func: *mut Option<unsafe extern "C" fn(_: usize, _: *mut c_void) -> *mut c_void>,
p_free_func: *mut Option<unsafe extern "C" fn(_: *mut c_void, _: *mut c_void)>,
p_user_data: *mut *mut c_void,
)