Satisfy Issue 699: Let Alt-right clicking in mouselook bring up pie menu

Also lltoolpie.cpp cleanup

indra/newview/lltoolcomp.cpp

@@ -764,6 +764,7 @@ BOOL LLToolCompGun::handleRightMouseDown(S32 x, S32 y, MASK mask)
 	// be shown.
 	return FALSE;
 	*/
+	if (mask & MASK_ALT) return false;
 
 	// Returning true will suppress the context menu
 	return TRUE;

indra/newview/lltoolpie.cpp

@@ -1092,9 +1092,6 @@ BOOL LLToolPie::handleRightClickPick()
 
 	// didn't click in any UI object, so must have clicked in the world
 	LLViewerObject *object = mPick.getObject();
-	LLViewerObject *parent = NULL;
-	if(object)
-		parent = object->getRootEdit();
 
 	// Can't ignore children here.
 	LLToolSelect::handleObjectSelection(mPick, FALSE, TRUE);