wip: desktop_app_info: Don't borrow mutable fds

Is this change ok?

Author: A6GibKm

gio/src/desktop_app_info.rs

@@ -55,9 +55,9 @@ pub trait DesktopAppInfoExtManual {
         spawn_flags: glib::SpawnFlags,
         user_setup: Option<Box_<dyn FnOnce() + 'static>>,
         pid_callback: Option<&mut dyn (FnMut(&DesktopAppInfo, glib::Pid))>,
-        stdin_fd: &mut T,
-        stdout_fd: &mut U,
-        stderr_fd: &mut V,
+        stdin_fd: &T,
+        stdout_fd: &U,
+        stderr_fd: &V,
     ) -> Result<(), Error>;
 }
 
@@ -71,9 +71,9 @@ impl<O: IsA<DesktopAppInfo>> DesktopAppInfoExtManual for O {
         spawn_flags: glib::SpawnFlags,
         user_setup: Option<Box_<dyn FnOnce() + 'static>>,
         pid_callback: Option<&mut dyn (FnMut(&DesktopAppInfo, glib::Pid))>,
-        stdin_fd: &mut T,
-        stdout_fd: &mut U,
-        stderr_fd: &mut V,
+        stdin_fd: &T,
+        stdout_fd: &U,
+        stderr_fd: &V,
     ) -> Result<(), Error> {
         let user_setup_data: Box_<Option<Box_<dyn FnOnce() + 'static>>> = Box_::new(user_setup);
         unsafe extern "C" fn user_setup_func<P: IsA<AppLaunchContext>>(