install docs and Apple/HP

[Gabriel Dos Reis]

Gerald Pfeifer <pfeifer@dbai.tuwien.ac.at> writes:

| In gcc/doc/install.texi we have the following four links (to Apple
| and HP sites), all of which are redirected, possibly to pages which
| are not useful any longer:
| 
|    + http://europe-support.external.hp.com/
|    + http://us-support.external.hp.com/
|    + http://www.opensource.apple.com/projects/darwin/
|    + http://www.opensource.apple.com/tools/cvs/docs.html
| 
| Would you mind having a look and updating doc/install.texi on mainline,
| 3.3, and ideally also 3.2?

Doc changes are OK for gcc-3_2-branch.

-- Gaby