New function to load windows system libraries

This function uses GetSystemDirectory() to make sure we load the version
of the library from c:\windows\system32 (or local equivalent) rather than
whatever version lives in the cwd.

src/common/util.h

@@ -340,6 +340,10 @@ void start_daemon(void);
 void finish_daemon(const char *desired_cwd);
 void write_pidfile(char *filename);
 
+#ifdef MS_WINDOWS
+HANDLE load_windows_system_library(const TCHAR *library_name);
+#endif
+
 const char *libor_get_digests(void);
 
 #endif