Finish this commit by prefixing HAVE_INITFINI_ARRAY and HAVE_INIT_FINI references...

Finish this commit by prefixing HAVE_INITFINI_ARRAY and HAVE_INIT_FINI references in libgloss in the same way.

Author: Mike Frysinger <vapier@gentoo.org>
Date:   Mon Jan 17 22:20:20 2022 -0500

    newlib: internalize HAVE_INITFINI_ARRAY

    This define is only used by newlib internally, so stop exporting it
    as HAVE_INITFINI_ARRAY since this can conflict with defines packages
    use themselves.

    We don't really need to add _ to HAVE_INIT_FINI too since it isn't
    exported in newlib.h, but might as well be consistent here.

    We can't (easily) add this to newlib_cflags like HAVE_INIT_FINI is
    because this is based on a compile-time test in the top configure,
    not on plain shell code in configure.host.  We'd have to replicate
    the test in every subdir in order to have it passed down.