Fix some includes in source/lib

Make include-what-you-use happy with some files in source/lib and fix
what needs to be fixed.

Ref: #8086
Signed-off-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>

source/lib/allocators/shared_ptr.cpp

@@ -1,4 +1,4 @@
-/* Copyright (C) 2021 Wildfire Games.
+/* Copyright (C) 2025 Wildfire Games.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
@@ -21,10 +21,11 @@
  */
 
 #include "precompiled.h"
-#include "lib/allocators/shared_ptr.h"
+
+#include "shared_ptr.h"
 
 #include "lib/allocators/allocator_checker.h"
-
+#include "lib/debug.h"
 
 #ifndef NDEBUG
 static AllocatorChecker s_allocatorChecker;