[COMMITTED] Remove obsolete Solaris 11.3 support

[Ian Lance Taylor]

On Thu, May 2, 2024 at 7:06 AM Rainer Orth <ro@cebitec.uni-bielefeld.de> wrote:
>
> * libgo configure.ac and Makefile.am can now expect HAVE_STAT_TIMESPEC
>   to be true and libgo_cv_lib_setcontext_clobbers_tls doesn't apply any
>   longer.  Any change would have to go upstream first and I don't know
>   about Ian's policy for keeping older versions supported.

There's no reason for libgo to support a version that GCC itself
doesn't support.  If you send me a patch I can apply it.  Thanks.

Ian