Use pointer coercion instead of messing with -sys

rust-bindings/rust/sys/src/manual.rs

@@ -1,29 +1 @@
 pub use libc::stat;
-
-pub mod fixed {
-    use crate::{OstreeObjectType, OstreeRepo};
-    use glib::gboolean;
-    use libc::c_char;
-
-    extern "C" {
-        pub fn ostree_repo_write_content(
-            self_: *mut OstreeRepo,
-            expected_checksum: *const c_char,
-            object_input: *mut gio::GInputStream,
-            length: u64,
-            out_csum: *mut *mut [u8; 32],
-            cancellable: *mut gio::GCancellable,
-            error: *mut *mut glib::GError,
-        ) -> gboolean;
-
-        pub fn ostree_repo_write_metadata(
-            self_: *mut OstreeRepo,
-            objtype: OstreeObjectType,
-            expected_checksum: *const c_char,
-            object: *mut glib::GVariant,
-            out_csum: *mut *mut [u8; 32],
-            cancellable: *mut gio::GCancellable,
-            error: *mut *mut glib::GError,
-        ) -> gboolean;
-    }
-}