[PATCH] 2.31 breaks build of 'gold' for x86_64-w64-mingw32

[Cary Coutant]

> Included into the AC_CHECK_FUNCS right above; updated patch attached.

        * gold/configure.ac: Add checks for link, mkdtemp.
        * gold/configure: Regenerated.
        * gold/config.in: Regenerated.
        * gold/plugin.cc (Plugin_recorder::init): Fall back to mktemp
        if mkdtemp is not available.
        (link_or_copy_file): Fall back to copy if link() is not available.

This is OK. Thanks!

-cary