Remove obsolete Solaris 10 support

[Jonathan Wakely]

On 13/05/19 13:39 +0200, Rainer Orth wrote:
>	libstdc++-v3:
>	* config/os/solaris/solaris2.10: Move to ...
>	* config/os/solaris: ... this.
>	* configure.host (os_include_dir): Adapt.
>	(abi_baseline_pair): Remove Solaris 10 handling.
>	* config/abi/post/i386-solaris2.10: Remove.
>	* config/abi/post/sparc-solaris2.10: Remove.
>	* config/abi/post/i386-solaris2.11: Rename to ...
>	* config/abi/post/i386-solaris: ... this.
>	* config/abi/post/sparc-solaris2.11: Rename to ...
>	* config/abi/post/sparc-solaris: ... this.
>
>	* libsupc++/new_opa.cc [_GLIBCXX_HAVE_MEMALIGN] [__sun__]: Remove
>	workaround.

It's not important, but the actual condition here uses __sun not
__sun__.

The libstdc++ parts are of course welcome!