toolchain/42088: Drop -U option (or make it the default)

[andrew.cagney%gmail.com@localhost]

>Number:         42088
>Category:       toolchain
>Synopsis:       Drop -U option (or make it the default)
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    toolchain-manager
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Thu Sep 17 21:30:00 +0000 2009
>Originator:     Andrew Cagney
>Release:        5.0
>Organization:
>Environment:
NetBSD rat 5.0 NetBSD 5.0 (GENERIC)
>Description:
The BUILDING files examples all specify -U (which is really good progress as 
the documentation is strongly encouraging a non-privileged build).

Can I encourage the next step which is to make that the only build style?  
>How-To-Repeat:

>Fix: