* alloca-conf.h (alloca) [C_ALLOCA]: Don't use Gcc builtin
        or <alloca.h>.
        * clock.c (GNU_HZ): New definition.
        (clock): Use it.
        * getruntime.c: Likewise.

        * config.table: Use mh-beos.
        * config/mh-beos: New file.

From-SVN: r29680