Function glib_sys::g_spawn_async_utf8

pub unsafe extern "C" fn g_spawn_async_utf8(
    working_directory: *const c_char, 
    argv: *mut *mut c_char, 
    envp: *mut *mut c_char, 
    flags: GSpawnFlags, 
    child_setup: GSpawnChildSetupFunc, 
    user_data: gpointer, 
    child_pid: *mut GPid, 
    error: *mut *mut GError
) -> gboolean

This is supported on Windows only.