Audio: removed deprecated Context::hrtfSpecifier().

Deprecated since 2018.02, use hrtfSpecifierString() instead.

doc/changelog.dox

@@ -327,6 +327,8 @@ See also:
 -   Removed compatibility code in @ref Audio::Context where
     @ref Audio::Context::current() would be usable with both @cpp . @ce and
     @cpp -> @ce, deprecated since 2017
+-   Removed @cpp Audio::Context::hrtfSpecifier() @ce deprecated since 2018.02.
+    Use @ref Audio::Context::hrtfSpecifierString() instead.
 -   Removed the `Shapes` library together with `DebugTools::ShapeRenderer`,
     which was a failed design experiment deprecated since version 2018.10
     (see [mosra/magnum#148](https://github.com/mosra/magnum/issues/148))

src/Magnum/Audio/Context.h

@@ -242,13 +242,6 @@ class MAGNUM_AUDIO_EXPORT Context {
          */
         std::string hrtfSpecifierString() const;
 
-        #ifdef MAGNUM_BUILD_DEPRECATED
-        /** @brief @copybrief hrtfSpecifierString()
-         * @deprecated Use @ref hrtfSpecifierString() instead.
-         */
-        CORRADE_DEPRECATED("use hrtfSpecifierString() instead") std::string hrtfSpecifier() const { return hrtfSpecifierString(); }
-        #endif
-
         /**
          * @brief Device specifier string
          *