* Makefile.am, Makefile.in: irix_threads.c is now

        hpux_irix_threads.c.
        * Makefile.orig: Updated from gc distribution Makefile.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@33255 138bc75d-0d04-0410-961f-82ee72b054a4