Revert "AK: Let the compiler provide the default new and delete operators"

This reverts commit 45b05e9734.

I forgot about the Toolchain build again. :^(

AK/kmalloc.h

@@ -26,7 +26,7 @@
 
 #pragma once
 
-#if !defined(__serenity__) || !defined(KERNEL)
+#ifndef __serenity__
 #    include <new>
 #endif
 
@@ -44,8 +44,53 @@
 #    include <Kernel/Heap/kmalloc.h>
 #else
 #    include <stdlib.h>
+
 #    define kcalloc calloc
 #    define kmalloc malloc
 #    define kfree free
 #    define krealloc realloc
+
+#    ifdef __serenity__
+
+inline void* operator new(size_t size)
+{
+    return kmalloc(size);
+}
+
+inline void operator delete(void* ptr)
+{
+    return kfree(ptr);
+}
+
+inline void operator delete(void* ptr, size_t)
+{
+    return kfree(ptr);
+}
+
+inline void* operator new[](size_t size)
+{
+    return kmalloc(size);
+}
+
+inline void operator delete[](void* ptr)
+{
+    return kfree(ptr);
+}
+
+inline void operator delete[](void* ptr, size_t)
+{
+    return kfree(ptr);
+}
+
+inline void* operator new(size_t, void* ptr)
+{
+    return ptr;
+}
+
+inline void* operator new[](size_t, void* ptr)
+{
+    return ptr;
+}
+#    endif
+
 #endif