[hurd,commited] hurd: fix conformity test for sys/un.h

[Joseph Myers]

On Wed, 18 Apr 2018, Samuel Thibault wrote:

> sun_len is used by BSD systems, and conformant.
> 
> 	* conform/data/sys/un.h-data (struct sockaddr_un): Allow sun_len
> 	member.

This is not correct.  optional-* is used when the relevant standards have 
a specification for a symbol, but do not require it to be defined.  In 
this case, the standards do not have a specification for sun_len - they 
have a permission to define arbitrary sun_* symbols, for which "allow 
sun_*" is the appropriate representation.

-- 
Joseph S. Myers
joseph@codesourcery.com