Fix build

nyalldawson · nyalldawson · commit eed758e0b43f · 2017-05-30T11:36:50.000+10:00
diff --git a/python/core/symbology-ng/qgssymbollayer.sip b/python/core/symbology-ng/qgssymbollayer.sip
@@ -105,7 +105,7 @@ class QgsSymbolLayer
       PropertyDistanceY, //!< Vertical distance between points
       PropertyDisplacementX, //!< Horizontal displacement
       PropertyDisplacementY, //!< Vertical displacement
-      PropertyAlpha, //!< Alpha (opacity)
+      PropertyOpacity, //!< Alpha (opacity)
       PropertyCustomDash, //!< Custom dash pattern
       PropertyCapStyle, //!< Line cap style
       PropertyPlacement, //!< Line marker placement
