Fix tooltip height for versions of irrlicht < 1.8.2

Version 1.8.2 of irrlicht changed the way that IGUIStaticText::getTextHeight() works and since that release properly deals with newlines.

From irrlicht changes.txt for 1.8.2, "IGUIStaticText::getTextHeight returns now the correct height for texts with newlines even WordWrap is not set."

src/guiFormSpecMenu.cpp

@@ -2265,7 +2265,11 @@ void GUIFormSpecMenu::drawList(const ListDrawSpec &s, int phase,
 				this->bringToFront(m_tooltip_element);
 				m_tooltip_element->setText(tooltip_text.c_str());
 				s32 tooltip_width = m_tooltip_element->getTextWidth() + m_btn_height;
+#if IRRLICHT_VERSION_MAJOR >= 1 && IRRLICHT_VERSION_MINOR >= 8 && IRRLICHT_VERSION_REVISION >= 2
 				s32 tooltip_height = m_tooltip_element->getTextHeight() + 5;
+#else
+				s32 tooltip_height = m_tooltip_element->getTextHeight() * tt_rows.size() + 5;
+#endif
 				v2u32 screenSize = driver->getScreenSize();
 				int tooltip_offset_x = m_btn_height;
 				int tooltip_offset_y = m_btn_height;