Remove BALM::Area::fConstraints field, which is not needed.

It's easier to just delete all the constraints in the dtor, the ones that
wouldn't have been in fConstraints are NULL at this point anyway.

headers/libs/alm/Area.h

@@ -6,7 +6,6 @@
 #define	AREA_H
 
 
-#include <ObjectList.h>
 #include <Referenceable.h>
 #include <Rect.h>
 #include <Size.h>
@@ -137,7 +136,6 @@ private:
 			double				fContentAspectRatio;
 			RowColumnManager*	fRowColumnManager;
 
-			BObjectList<LinearProgramming::Constraint>	fConstraints;
 			LinearProgramming::Constraint* fMinContentWidth;
 			LinearProgramming::Constraint* fMaxContentWidth;
 			LinearProgramming::Constraint* fMinContentHeight;