Fix stylesheet hack to only be used with 4.6

Note: If you are compiling with 4.6 but running against 4.7 then this
will result in a slightly buggy line edit.
Reviewed-by: Friedemann Kleint <qtc-committer@nokia.com>

src/libs/utils/fancylineedit.cpp

@@ -166,8 +166,11 @@ void FancyLineEdit::updateStyleSheet(Side side)
     if (m_d->m_showingHintText)
         sheet += QLatin1String(" color: #BBBBBB;");
     // Fix the stylesheet's clearing the size hint.
+
+#if QT_VERSION < 0x040700
     sheet += QLatin1String(" height: ");
     sheet += QString::number(sizeHint().height());
+#endif
     sheet += QLatin1Char('}');
     setStyleSheet(sheet);
 }