CINE: Remove the comment about an old PalmOS compiler

The problematic compiler wouldn't be able to compile any C++11 code,
and the PalmOS port has been removed more than 10 years ago anyway.

Looking at the following original commits

- 3ed2192923a146ee4b3f0784396d8e5479d68778
- 420569626c84be5242237125745a117a6ff9a8b9
- 17fef2950718cc38fb7f7bfc1f634ed1b7491eaf

it appears that this workaround was actually meant to be kept, in the
end, so just remove the comment itself.

engines/cine/pal.h

@@ -178,11 +178,6 @@ private:
 	int findMinBrightnessColorIndex(uint minColorIndex = 1);
 	byte brightness(byte colorIndex);
 	void setColorFormat(const Graphics::PixelFormat format);
-
-	// WORKAROUND: Using a reference to a result here instead of returning an Color object.
-	// This is needed because when using a Color as return value, this would crash Chrilith's
-	// compiler for PalmOS.
-	// TODO: Add more information about the compiler.
 	void saturatedAddColor(Color &result, const Color &baseColor, signed r, signed g, signed b) const;
 
 private: