Remove utils module from examples

It's unused now

examples/src/bin/utils/mod.rs

@@ -1,64 +0,0 @@
-extern crate gstreamer as gst;
-use gst::prelude::*;
-
-extern crate glib;
-use std::fmt;
-
-#[derive(Debug, Clone)]
-pub enum ExampleError {
-    InitFailed(glib::Error),
-    ElementNotFound(&'static str),
-    ElementLinkFailed(::std::string::String, ::std::string::String),
-    SetStateError(::std::string::String),
-    ElementError(::std::string::String, glib::Error, ::std::string::String),
-    MissingFeature(&'static str),
-}
-
-impl fmt::Display for ExampleError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        match *self {
-            ExampleError::InitFailed(ref e) => {
-                write!(f, "GStreamer initialization failed: {:?}", e)
-            }
-            ExampleError::ElementNotFound(e) => write!(f, "Element {} not found", e),
-            ExampleError::ElementLinkFailed(ref e1, ref e2) => {
-                write!(f, "Link failed between {} and {}", e1, e2)
-            }
-            ExampleError::SetStateError(ref state) => {
-                write!(f, "Pipeline failed to switch to state {}", state)
-            }
-            ExampleError::ElementError(ref element, ref err, ref debug) => {
-                write!(f, "Error from {}: {} ({:?})", element, err, debug)
-            }
-            ExampleError::MissingFeature(feature) => write!(
-                f,
-                "Feature {} is required. Please rebuild with --features {}",
-                feature,
-                feature
-            ),
-        }
-    }
-}
-
-pub fn create_element(name: &'static str) -> Result<gst::Element, ExampleError> {
-    gst::ElementFactory::make(name, None).ok_or_else(|| ExampleError::ElementNotFound(name))
-}
-
-pub fn link_elements(e1: &gst::Element, e2: &gst::Element) -> Result<(), ExampleError> {
-    match gst::Element::link(e1, e2) {
-        Ok(o) => Ok(o),
-        Err(_) => Err(ExampleError::ElementLinkFailed(
-            e1.get_name(),
-            e2.get_name(),
-        )),
-    }
-}
-
-pub fn set_state(e: &gst::Pipeline, state: gst::State) -> Result<(), ExampleError> {
-    if let gst::StateChangeReturn::Failure = e.set_state(state) {
-        return Err(ExampleError::SetStateError(
-            gst::Element::state_get_name(state).unwrap(),
-        ));
-    }
-    Ok(())
-}