src: include util-inl.h in worker_agent.cc

Otherwise, the compiler complains about a missing definition
for the (inline) `Calloc` function.

Author: addaleax

src/inspector/worker_agent.cc

@@ -2,6 +2,7 @@
 
 #include "main_thread_interface.h"
 #include "worker_inspector.h"
+#include "util-inl.h"
 
 namespace node {
 namespace inspector {