Missing const fixed.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@765 dfc29bdd-3216-0410-991c-e03cc46cb475

include/IGUISkin.h

@@ -479,7 +479,7 @@ namespace gui
 		\param pos: Position of the rectangle.
 		\param clip: Pointer to rectangle against which the rectangle will be clipped.
 		If the pointer is null, no clipping will be performed. */
-		virtual void draw2DRectangle(IGUIElement* element, video::SColor &color, 
+		virtual void draw2DRectangle(IGUIElement* element, const video::SColor &color, 
 			const core::rect<s32>& pos, const core::rect<s32>* clip = 0) = 0;
 
 		//! get the type of this skin

source/Irrlicht/CGUISkin.cpp

@@ -771,7 +771,8 @@ EGUI_SKIN_TYPE CGUISkin::getType() const
 }
 
 //! draws a 2d rectangle.
-void CGUISkin::draw2DRectangle(IGUIElement* element, video::SColor &color, const core::rect<s32>& pos, 
+void CGUISkin::draw2DRectangle(IGUIElement* element,
+		const video::SColor &color, const core::rect<s32>& pos,
 		const core::rect<s32>* clip)
 {
 	Driver->draw2DRectangle(color, pos, clip);

source/Irrlicht/CGUISkin.h

@@ -199,7 +199,7 @@ namespace gui
 		\param pos: Position of the rectangle.
 		\param clip: Pointer to rectangle against which the rectangle will be clipped.
 		If the pointer is null, no clipping will be performed. */
-		virtual void draw2DRectangle(IGUIElement* element, video::SColor &color, 
+		virtual void draw2DRectangle(IGUIElement* element, const video::SColor &color, 
 			const core::rect<s32>& pos, const core::rect<s32>* clip = 0);