sc-calcoptionsdlg.hxx: add definition guards (HAVE_FEATURE_OPENCL)

fixes "error: 'OpenCLConfig' does not name a type" when building
without OpenCL support

Change-Id: I21b05ca2ea5b197029af0de9b049a3a14b00f714
Reviewed-on: https://gerrit.libreoffice.org/13667Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sc/source/ui/optdlg/calcoptionsdlg.hxx

@@ -59,8 +59,10 @@ private:
 
     SvTreeListEntry *createItem(const OUString &rCaption, const OUString& sValue) const;
     void     setValueAt(size_t nPos, const OUString &rString);
+#if HAVE_FEATURE_OPENCL
     OpenCLConfig::ImplMatcherSet& CurrentWhiteOrBlackList();
     const OpenCLConfig::ImplMatcher& CurrentWhiteOrBlackListEntry();
+#endif
 
 private: