hooklib: Split out of util

This is distinct from capnhook's hooklib, although the intent is
the same. Hopefully these two libraries sharing a name won't get
too confusing...

hooklib/fdshark.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <windows.h>
+
+#include <stdbool.h>
+#include <stddef.h>
+
+enum {
+    FDSHARK_FORCE_SYNC = 0x1,
+    FDSHARK_TRACE_READ = 0x2,
+    FDSHARK_TRACE_WRITE = 0x4,
+    FDSHARK_TRACE_IOCTL = 0x8,
+    FDSHARK_ALL_FLAGS_ = 0xF,
+};
+
+HRESULT fdshark_hook_init(const wchar_t *filename, int flags);