installation information tweaks

[Dave Love]

>>>>> "Ian" == Ian Lance Taylor <ian@cygnus.com> writes:

 Ian> I already checked in a workaround for one bug that was specific to the
 Ian> HP/UX 10.20 version of sed:

 Ian> Wed Oct  2 17:29:53 1996  Ian Lance Taylor  <ian@cygnus.com>

 Ian> 	* fixincludes: Add a hack to the big sed script to work around a
 Ian> 	bug in the sed implementation on HP/UX 10.20.


 Ian> What is the bug that you are discussing here?  Would it be possible to
 Ian> work around it?

Oops, sorry.  I don't know why I thought it was still an issue.  I've
no evidence that there is a problem now.