LibC: Run constructors on process startup.

Cooperate with the compiler to generate and execute the _init_array list
of constructor functions on userspace program statup. This took two days
to get working, my goodness. :^)

AK/kmalloc.h

@@ -1,5 +1,9 @@
 #pragma once
 
+#ifndef KERNEL
+#include <new>
+#endif
+
 #if defined(SERENITY) && defined(KERNEL)
 #define AK_MAKE_ETERNAL \
 public: \
@@ -23,6 +27,31 @@ void kfree(void* ptr);
 
 }
 
+#ifdef KERNEL
 inline void* operator new(size_t, void* p) { return p; }
 inline void* operator new[](size_t, void* p) { return p; }
+#else
+
+inline void* operator new(size_t size)
+{
+    return kmalloc(size);
+}
+
+inline void operator delete(void* ptr)
+{
+    return kfree(ptr);
+}
+
+inline void* operator new[](size_t size)
+{
+    return kmalloc(size);
+}
+
+inline void operator delete[](void* ptr)
+{
+    return kfree(ptr);
+}
+
+#endif
+
 #endif