Because hashtest2 has to provide symbols for things in asterisk that items
it includes may use, when astobj2 decided to use ast_register_atexit it needed
to provide a declaration for that as well.  Otherwise - no linky.

On a related note, ASTERISK-20505 was filed to convert hashtest/hashtest2 into
actual unit tests, so we don't run into this problem again.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@374229 65c4cc65-6c06-0410-ace0-fbb531ad65f3