[v3] Fix an ext testcase

[Kaveh R. Ghazi]

 > 2005-01-01  Paolo Carlini  <pcarlini@suse.de>
 > 
 >         * testsuite/ext/enc_filebuf/char/13189.cc: Fix, first include
 > 	testsuite_hooks.h, to know whether including ext/enc_filebuf.h.
 > 	* testsuite/ext/enc_filebuf/wchar_t/13189.cc: Likewise.
 > 

With this and your previous patch, I now get zero unexpected failures
in libstdc++, thanks!

http://gcc.gnu.org/ml/gcc-testresults/2005-01/msg00084.html
http://gcc.gnu.org/ml/gcc-testresults/2005-01/msg00085.html

		--Kaveh
--
Kaveh R. Ghazi			ghazi@caip.rutgers.edu