[PATCH] x86: Install <cpu-features.h> [BZ #26124]

[Joseph Myers]

On Wed, 17 Jun 2020, H.J. Lu via Libc-alpha wrote:

> Install <cpu-features.h> so that programmers can do

This appears to be x86-specific.  The convention for such 
architecture-specific headers is names such as sys/platform/x86.h (with 
corresponding naming conventions for individual symbols as documented in 
maint.texi).

This patch needs documentation in the glibc manual of the API provided by 
this header (which would also say that it's x86-specific, and go in 
platform.texi alongside other such documentation of architecture-specific 
interfaces).

New features should also have NEWS entries.

-- 
Joseph S. Myers
joseph@codesourcery.com