Using gethostbyname_r instead of gethostbyname in std.socket

[MWumpusZ via Digitalmars-d]

We are currently using phobos from 
http://downloads.dlang.org/releases/2016/dmd.2.071.0.linux.zip

Phobos' InternetAddress contained therein uses gethostbyname and 
not gethostbyname_r; std.socket imports core.sys.posix.netdb, 
which only makes gethostbyname available.

gethostbyname_r would be made available by importing 
std.c.linux.socket, but this is marked as deprecated in favour of 
core.sys.posix.BLAH

The use of gethostbyname is a problem for us because, even though 
std.socket synchronises access to the function, we are using a 
third party (non-D) library in our application which also uses 
gethostbyname, and of course that library doesn't care about the 
synchronisation in std.socket.


Is there a reason why gethostbyname_r isn't usually used?
Even for those environments which don't have it, version(linux) 
(or whatever) in core.sys.posix.netdb should be able to deal with 
that easily, shouldn't it?