[doc] install.texi, update links to packages for Solaris

[Gerald Pfeifer]

On Wed, 9 Jul 2014, Tom G. Christensen wrote:
> Patch applies to trunk, gcc 4.9 and gcc 4.8 branches.
> 
> 2014-07-09  Tom G. Christensen  <tgc@jupiterrise.com>
> 
> 	* doc/install.texi: Remove links to defunct package providers for
> 	Solaris

Thanks, Tom!  I was just going to create the same patch, but since you 
already had done I applied this to trunk and the GCC 4.9 and 4.8 branches.

And I manually re-ran the nightly script on gcc.gnu.org such that
  https://gcc.gnu.org/install/binaries.html
is updated.

Gerald