gcconfig.h (DATASTART): Define as (&data_start) for PowerPC Linux.

        * gcconfig.h (DATASTART): Define as (&data_start) for PowerPC
        Linux.
        (DYNAMIC_LOADING): Define for PowerPC Linux.
        * os_dep.c: Remove some special cases for PowerPC Linux.
        * misc.c (GC_init_inner): Don't call GC_init_linux_data_start
        for PowerPC Linux.

From-SVN: r30873