[PATCH 04/10] Convert signal.h from __need macros to bits/types/ headers.

[Joseph Myers]

On Tue, 9 May 2017, Zack Weinberg wrote:

> Internal code that wants to manipulate signal masks must now include
> <bits/sigsetops.h> (which is not installed) and should be aware that

<bits/*.h> names should be used only for installed headers.  A 
non-installed header should be named something else.

This is not a review of the rest of this patch.

-- 
Joseph S. Myers
joseph@codesourcery.com