Include <util/kernel_cpp.h> in DoublyLinkedList.h only when compiling

for the kernel. Added missing includes in userland code that uses the
header.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20366 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/debug/SymbolLookup.cpp

@@ -3,10 +3,13 @@
  * Distributed under the terms of the MIT License.
  */
 
+#include "SymbolLookup.h"
+
+#include <new>
+
 #include <string.h>
 #include <runtime_loader.h>
 
-#include "SymbolLookup.h"
 
 using std::nothrow;
 using namespace BPrivate;