Fixed: compiling warning for the function CGContextDrawImage

AppKit/CPDatePicker/_CPDatePickerClock.j

@@ -24,7 +24,6 @@
 @import "CPTextField.j"
 @import "CPImageView.j"
 @import "CALayer.j"
-@import "CPGraphicsContext.j"
 
 @class _CPCibCustomResource
 @class CPDatePicker

AppKit/CoreGraphics/CGContext.j

@@ -738,7 +738,7 @@ else if (CPFeatureIsCompatible(CPVMLFeature))
 else
 {
     // I have declared these functions here to make it compile without warnings with the new compiler under rhino.
-    CGContextClearRect = CGContextDrawLinearGradient = CGContextClip = CGContextClipToRect = function() {throw new Error("function is not declared in this environment")}
+    CGContextClearRect = CGContextDrawLinearGradient = CGContextClip = CGContextClipToRect = CGContextDrawImage = function() {throw new Error("function is not declared in this environment")}
 }
 /*!
 @endcond