Add an \extref doxygen pointer for libuuid.

Thanks to Olle Johansson for suggesting this.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@386638 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/uuid.c

@@ -18,6 +18,8 @@
 
 /*! \file
  * \brief Universally unique identifier support
+ *
+ * \extref Depends on libuuid, a component of the e2fsprogs package - http://e2fsprogs.sourceforge.net/
  */
 
 #include "asterisk.h"