Cycles: Fix long compile time with MSVC.

Compile time per kernel increased alot after recent image commits, re-shuffle some code to fix this.

Patch by "LazyDodo".

Differential Revision: https://developer.blender.org/D2012

intern/cycles/kernel/osl/osl_services.cpp

@@ -45,7 +45,7 @@
 #include "kernel_differential.h"
 #include "kernel_montecarlo.h"
 #include "kernel_camera.h"
-
+#include "kernels/cpu/kernel_cpu_image.h"
 #include "geom/geom.h"
 
 #include "kernel_projection.h"