[patch,doc] Remove dead/inactive links for GCC binaries

[Jeff Law]

On 08/22/2015 01:01 AM, FX wrote:
> Attached patch cleans up the list of links we provide for GCC binaries:
>
> - pware.hvcc.edu is dead, no mirror or newer alternative found
> - h8300-hms.sourceforge.net is inactive since 2003, carries only gcc 3.2 and 3.3
> - sunsite.informatik.rwth-aachen.de only has gcc 3.0.1
> - SCO website has gcc 2.95.2
> - ftp.thewrittenword.com only offers gcc 4.0.2
>
> Tested with "make pdf info html", OK to commit?
One could argue all this ought to go away, but no reason to hold up your 
cleanup.  So this is fine for the trunk.

jeff