hook/process.c: Add process startup interceptor

hook/process.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <windows.h>
+
+typedef DWORD (CALLBACK *process_entry_t)(void);
+
+HRESULT process_hijack_startup(
+        process_entry_t new_entry,
+        process_entry_t *orig_entry);