Audio, GL: remove deprecated Context conversion to pointer.

Deprecated since 2017.

doc/changelog.dox

@@ -324,6 +324,9 @@ See also:
 -   Removed remaining @ref Platform::Sdl2Application "Platform::*Application"
     constructors taking @cpp nullptr @ce instead of @ref NoCreate, deprecated
     since 2017
+-   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 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

@@ -193,11 +193,6 @@ class MAGNUM_AUDIO_EXPORT Context {
         /** @brief Move assignment is not allowed */
         Context& operator=(Context&& other) = delete;
 
-        #if defined(MAGNUM_BUILD_DEPRECATED) && !defined(DOXYGEN_GENERATING_OUTPUT)
-        CORRADE_DEPRECATED("Audio::Context::current() returns reference now") Context* operator->() { return this; }
-        CORRADE_DEPRECATED("Audio::Context::current() returns reference now") operator Context*() { return this; }
-        #endif
-
         /**
          * @brief Complete the context setup and exit on failure
          *

src/Magnum/GL/Context.h

@@ -424,11 +424,6 @@ class MAGNUM_GL_EXPORT Context {
         /** @brief Move assignment is not allowed */
         Context& operator=(Context&&) = delete;
 
-        #if defined(MAGNUM_BUILD_DEPRECATED) && !defined(DOXYGEN_GENERATING_OUTPUT)
-        CORRADE_DEPRECATED("Context::current() returns reference now") Context* operator->() { return this; }
-        CORRADE_DEPRECATED("Context::current() returns reference now") operator Context*() { return this; }
-        #endif
-
         /**
          * @brief OpenGL version
          *