Update GCC to autoconf 2.69, automake 1.15.1

[Ian Lance Taylor]

On Tue, Oct 30, 2018 at 8:26 PM, Joseph Myers <joseph@codesourcery.com> wrote:
>
> This patch (diffs to generated files omitted below) updates GCC to use
> autoconf 2.69 and automake 1.15.1.  (That's not the latest automake
> version, but it's the one used by binutils-gdb, with which consistency
> is desirable, and in any case seems a useful incremental update that
> should make a future update to 1.16.1 easier.)

Thanks for doing this.  As usual, please skip the patch to the libgo
directory; I'll commit that myself.  The patch to gotools is fine to
commit any time you are ready.

Ian