Enable feature(doc_cfg) in all lib.rs

The next version of gir is going to generate doc(cfg()) attributes on
many symbols to show feature-dependence hints. While autogenerated sys
crates get this attribute in their own (generated) lib.rs file the safe
wrapper crates do not have such an autogenerated lib.rs file.

gstreamer-app/src/lib.rs

@@ -6,6 +6,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
+
 extern crate libc;
 
 extern crate futures_core;

gstreamer-audio/src/lib.rs

@@ -6,6 +6,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
+
 extern crate array_init;
 #[macro_use]
 extern crate bitflags;

gstreamer-base/src/lib.rs

@@ -6,6 +6,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
+
 extern crate glib_sys;
 extern crate gobject_sys;
 #[macro_use]

gstreamer-check/src/lib.rs

@@ -6,6 +6,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
+
 extern crate glib_sys;
 extern crate gobject_sys;
 extern crate gstreamer as gst;

gstreamer-controller/src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
+
 #[macro_use]
 extern crate glib;
 extern crate glib_sys;

gstreamer-editing-services/src/lib.rs

@@ -6,6 +6,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
+
 extern crate libc;
 
 use std::sync::Once;

gstreamer-gl/src/lib.rs

@@ -7,6 +7,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
+
 #[macro_use]
 extern crate bitflags;
 extern crate byteorder;

gstreamer-net/src/lib.rs

@@ -6,6 +6,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
+
 extern crate gio;
 extern crate glib_sys;
 extern crate gobject_sys;

gstreamer-pbutils/src/lib.rs

@@ -6,6 +6,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
+
 #[macro_use]
 extern crate bitflags;
 extern crate libc;

gstreamer-player/src/lib.rs

@@ -6,6 +6,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
+
 extern crate libc;
 
 extern crate glib_sys;

gstreamer-rtp/src/lib.rs

@@ -6,6 +6,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
+
 #[macro_use]
 extern crate bitflags;
 extern crate once_cell;

gstreamer-rtsp-server/src/lib.rs

@@ -6,6 +6,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
+
 #[macro_use]
 extern crate bitflags;
 extern crate libc;

gstreamer-rtsp/src/lib.rs

@@ -6,6 +6,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
+
 #[macro_use]
 extern crate bitflags;
 extern crate libc;

gstreamer-sdp/src/lib.rs

@@ -6,6 +6,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
+
 #[macro_use]
 extern crate glib;
 extern crate glib_sys;

gstreamer-video/src/lib.rs

@@ -6,6 +6,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
+
 #[macro_use]
 extern crate bitflags;
 extern crate libc;

gstreamer-webrtc/src/lib.rs

@@ -6,6 +6,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
+
 extern crate libc;
 
 #[macro_use]

gstreamer/src/lib.rs

@@ -6,6 +6,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![cfg_attr(feature = "dox", feature(doc_cfg))]
 #![recursion_limit = "256"]
 #[macro_use]
 extern crate bitflags;