Fix for declared near() function, backport from ART. Various other minor changes.

rtengine/improcfun.h

@@ -49,7 +49,6 @@ namespace rtengine
 class ColorAppearance;
 class ColorGradientCurve;
 class DCPProfile;
-class DCPProfile::ApplyState;
 class FlatCurve;
 class FramesMetaData;
 class LensCorrection;