[v3, build, doc, testsuite] Remove obsolete Solaris 7 support

[Paolo Carlini]

On 04/08/2010 05:20 PM, Rainer Orth wrote:
> The following patch implements the announced removal of Solaris 7
> support.  Nothing spectacular; I've just removed any reference to it
> except from a few instances in install.texi where they are still
> technically correct.
>
> I don't think I need approval, except perhaps for the testsuite and
> libstdc++ parts, which should be obvious.
>
> Tested by configuring for i386-pc-solaris2.7 and verifying that the gcc
> configure fails as expected, and a bootstrap on i386-pc-solaris2.10
> without regressions.
>
> Ok for mainline?
>   
Ok, thanks.

Paolo.