implement out-of-line destructors where needed instead of using __DARWIN__

specific conditional compilation


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13447 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/gaugecmn.cpp

@@ -39,6 +39,11 @@
 // implementation
 // ============================================================================
 
+wxGaugeBase::~wxGaugeBase()
+{
+    // this destructor is required for Darwin
+}
+
 // ----------------------------------------------------------------------------
 // wxGauge creation
 // ----------------------------------------------------------------------------