Add printf format checking.
Add printf format checking.

Patch by: Mark Benedetto King <bking@inquira.com>

* subversion/include/svn_io.h (svn_stream_printf): Add printf __attribute__.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion