+ fix various warnings

src/Mod/Spreadsheet/App/Cell.cpp

@@ -187,7 +187,8 @@ bool Cell::getStringContent(std::string & s) const
             s = static_cast<StringExpression*>(expression)->getText();
             char * end;
             errno = 0;
-            strtod(s.c_str(), &end);
+            double d = strtod(s.c_str(), &end);
+            (void)d; // fix gcc warning
             if (!*end && errno == 0)
                 s = "'" + s;
         }

src/Mod/Spreadsheet/Gui/qtcolorpicker.cpp

@@ -897,7 +897,7 @@ void ColorPickerPopup::regenerateGrid()
 */
 void ColorPickerPopup::getColorFromDialog()
 {
-    bool ok;
+    //bool ok;
     //QRgb rgb = QColorDialog::getRgba(lastSel.rgba(), &ok, parentWidget());
     QColor col = QColorDialog::getColor(lastSel,parentWidget(),0,QColorDialog::ShowAlphaChannel);
     if (!col.isValid())