[Bug target/84148] CET shouldn't be enabled in 32-bit run-time libraries by default

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84148

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Florian Weimer from comment #1)
> How old are the CPUs which treat it as UD?  Older than i686/Pentium Pro? 
> Thanks.

They are NOPs since Pentium Pro.