* Makefile.am, configure.ac: Add new test to account for properly
handling keys when a thread has non-NULL key value and key has NULL
destructor and when a thread has NULL key value and key has
destructor.
* psxkey03/.cvsignore, psxkey03/Makefile.am, psxkey03/init.c,
psxkey03/psxkey03.doc, psxkey03/psxkey03.scn: New files.
