doc: Remove blastwave.org link

Apparently, this service has been dead since 2008.

doc/src/sgml/installation.sgml

@@ -2840,8 +2840,8 @@ MANPATH=/usr/lib/scohelp/%L/man:/usr/dt/man:/usr/man:/usr/share/man:scohelp:/usr
      Many of GNU tools are integrated into Solaris 10, or they are
      present on the Solaris companion CD.  If you like packages for
      older version of Solaris, you can find these tools
-     at <ulink url="http://www.sunfreeware.com"></ulink>
-     or <ulink url="http://www.blastwave.org"></ulink>.  If you prefer
+     at <ulink url="http://www.sunfreeware.com"></ulink>.
+     If you prefer
      sources, look
      at <ulink url="http://www.gnu.org/order/ftp.html"></ulink>.
     </para>