Resync with GDB (from "port GDB to ia64-hpux (native).")

ChangeLog:

            * configure.ac: Remove readline, mmalloc, and gdb from noconfigdirs
            for ia64-hpux.
            * configure: Regenerate.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@168758 138bc75d-0d04-0410-961f-82ee72b054a4