Merge branch 'disable-native-animation'

Allow the generic animation classes to be used on all platforms.

See https://github.com/wxWidgets/wxWidgets/pull/1768

docs/doxygen/mainpages/const_cpp.h

@@ -185,6 +185,7 @@ Currently the following symbols exist:
     decide whether some function should be overloaded for both
     <code>long</code> and <code>long long</code> types.}
 @itemdef{wxHAS_MULTIPLE_FILEDLG_FILTERS, Defined if wxFileDialog supports multiple ('|'-separated) filters.}
+@itemdef{wxHAS_NATIVE_ANIMATIONCTRL, Defined if native wxAnimationCtrl class is being used (this symbol only exists in wxWidgets 3.1.4 and later).}
 @itemdef{wxHAS_NATIVE_DATAVIEWCTRL, Defined if native wxDataViewCtrl class is being used (this symbol only exists in wxWidgets 3.1.4 and later).}
 @itemdef{wxHAS_NATIVE_WINDOW, Defined if wxNativeWindow class is available.}
 @itemdef{wxHAS_NULLPTR_T, Defined if the currently used compiler supports C++11 @c nullptr.}