Remove table of mostly null pointers

The patch moves the initialization of the format to format blend tables
to runtime, so we only have to explicitly set the values that are
not null. This removes most of the lines in qblendfunctions.cpp.

Change-Id: Ie017f380ff11cfb764a631cfea7626786731b5fb
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

src/gui/kernel/qguiapplication.cpp

@@ -185,6 +185,7 @@ extern void qRegisterGuiVariant();
 #ifndef QT_NO_ANIMATION
 extern void qRegisterGuiGetInterpolator();
 #endif
+extern void qInitBlendFunctions();
 extern void qInitDrawhelperAsm();
 extern void qInitImageConversions();
 
@@ -1279,6 +1280,8 @@ void QGuiApplicationPrivate::init()
     if (platform_integration == 0)
         createPlatformIntegration();
 
+    // Set up blend function tables.
+    qInitBlendFunctions();
     // Set up which span functions should be used in raster engine...
     qInitDrawhelperAsm();
     // and QImage conversion functions