Changes to allow Haiku source to build with GCC 4.7

* GCC 4.7 is more picky than GCC 4.6, so have to make changes accordingly
* Changes include addressing issues with scoping, redeclaration, etc.
Thanks Rene and Ingo for your input on these changes

headers/os/interface/LayoutBuilder.h

@@ -1328,7 +1328,7 @@ MenuItem<ParentBuilder>::MenuItem(ParentBuilder* parentBuilder, BMenu* menu,
 	Menu<ParentBuilder>(menu),
 	fMenuItem(item)
 {
-	SetParent(parentBuilder);
+	this->SetParent(parentBuilder);
 }
 
 

src/apps/readonlybootprompt/BootPromptWindow.cpp

@@ -224,10 +224,10 @@ BootPromptWindow::MessageReceived(BMessage* message)
 
 				// Select default keymap by language
 				BLanguage language(item->Language());
-				BMenuItem* item = _KeymapItemForLanguage(language);
-				if (item != NULL) {
-					item->SetMarked(true);
-					_ActivateKeymap(item->Message());
+				BMenuItem* keymapItem = _KeymapItemForLanguage(language);
+				if (keymapItem != NULL) {
+					keymapItem->SetMarked(true);
+					_ActivateKeymap(keymapItem->Message());
 				}
 			}
 			// Calling it here is a cheap way of preventing the user to have

src/bin/bfs_tools/lib/Stack.h

@@ -6,6 +6,8 @@
 */
 
 
+#include <stdlib.h>
+
 #include <SupportDefs.h>
 
 

src/kits/interface/AbstractLayout.cpp

@@ -30,6 +30,10 @@ struct BAbstractLayout::Proxy {
 	{
 	}
 
+	virtual ~Proxy()
+	{
+	}
+
 	virtual	BSize		MinSize() const = 0;
 	virtual void		SetMinSize(const BSize&) = 0;
 

src/kits/interface/Layout.cpp

@@ -222,7 +222,7 @@ bool
 BLayout::RemoveItem(BLayoutItem* item)
 {
 	int32 index = IndexOfItem(item);
-	return (index >= 0 ? RemoveItem(index) : false);
+	return (index >= 0 ? RemoveItem(index) != NULL : false);
 }