[Ada] Fix PR ada/79903

[Eric Botcazou]

This (apparently) fixes the build of the runtime on RTEMS.

Tested on x86-64/Linux, applied on mainline and 6 branch.


2017-03-08  Thanassis Tsiodras  <ttsiod...@gmail.com>

        PR ada/79903
        * socket.c (__gnat_gethostbyaddr): Add missing test for __rtems__.

-- 
Eric Botcazou
Index: socket.c
===================================================================
--- socket.c	(revision 245628)
+++ socket.c	(working copy)
@@ -202,7 +202,7 @@ __gnat_gethostbyaddr (const char *addr,
   struct hostent *rh;
   int ri;
 
-#if defined(__linux__) || defined(__GLIBC__)
+#if defined(__linux__) || defined(__GLIBC__) || defined(__rtems__)
   (void) gethostbyaddr_r (addr, len, type, ret, buf, buflen, &rh, h_errnop);
 #else
   rh = gethostbyaddr_r (addr, len, type, ret, buf, buflen, h_errnop);