Fix harmless unused variable warning in some build configurations.

Don't declare the variables if they are not going to be used.

Closes #16830.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78436 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/richtext/richtextbuffer.cpp

@@ -8795,12 +8795,12 @@ bool wxRichTextBuffer::SaveFile(wxOutputStream& stream, wxRichTextFileType type)
 bool wxRichTextBuffer::CopyToClipboard(const wxRichTextRange& range)
 {
     bool success = false;
+#if wxUSE_CLIPBOARD && wxUSE_DATAOBJ
+
     wxRichTextParagraphLayoutBox* container = this;
     if (GetRichTextCtrl())
         container = GetRichTextCtrl()->GetFocusObject();
 
-#if wxUSE_CLIPBOARD && wxUSE_DATAOBJ
-
     if (!wxTheClipboard->IsOpened() && wxTheClipboard->Open())
     {
         wxTheClipboard->Clear();