wxButtonBase::GetDefaultSize is declared but not implemented in the wxOSX-cocoa port. Add an implementation that uses wxAnyButton::GetDefaultSize.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67936 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/button_osx.cpp

@@ -131,6 +131,12 @@ bool wxButton::OSXHandleClicked( double WXUNUSED(timestampsec) )
     return true;
 }
 
+/* static */
+wxSize wxButtonBase::GetDefaultSize()
+{
+    return wxAnyButton::GetDefaultSize();
+}
+
 //-------------------------------------------------------
 // wxDisclosureTriangle
 //-------------------------------------------------------