add feature non-exhaustive-enums

src/software/resampling/dither.rs

@@ -35,6 +35,7 @@ impl From<SwrDitherType> for Dither {
             SWR_DITHER_NS_HIGH_SHIBATA => Dither::NoiseShapingHighShibata,
             SWR_DITHER_NB => Dither::None,
 
+            #[cfg(feature = "non-exhaustive-enums")]
             _ => unimplemented!(),
         }
     }

src/software/resampling/engine.rs

@@ -14,6 +14,7 @@ impl From<SwrEngine> for Engine {
             SWR_ENGINE_SOXR => Engine::SoundExchange,
             SWR_ENGINE_NB => Engine::Software,
 
+            #[cfg(feature = "non-exhaustive-enums")]
             _ => unimplemented!(),
         }
     }

src/software/resampling/filter.rs

@@ -15,6 +15,7 @@ impl From<SwrFilterType> for Filter {
             SWR_FILTER_TYPE_BLACKMAN_NUTTALL => Filter::BlackmanNuttall,
             SWR_FILTER_TYPE_KAISER => Filter::Kaiser,
 
+            #[cfg(feature = "non-exhaustive-enums")]
             _ => unimplemented!(),
         }
     }