[PATCH] nss: Remove RES_USE_INET6 usage

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The recent deprecation in glibc (commit b76e065991ec) means the
module will fail to build entirely:

  nss/libvirt_nss.c: In function '_nss_libvirt_gethostbyname_r':
  nss/libvirt_nss.c:363:13: error: RES_USE_INET6 is deprecated [-Werror]
     int af = ((_res.options & RES_USE_INET6) ? AF_INET6 : AF_INET);
             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This resolver option was removed shortly after being introduced,
and application using it are already broken anyway.
---
 tools/nss/libvirt_nss.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/tools/nss/libvirt_nss.c b/tools/nss/libvirt_nss.c
index b69e62c..9904026 100644
--- a/tools/nss/libvirt_nss.c
+++ b/tools/nss/libvirt_nss.c
@@ -360,9 +360,7 @@ NSS_NAME(gethostbyname)(const char *name, struct hostent *result,
                         char *buffer, size_t buflen, int *errnop,
                         int *herrnop)
 {
-    int af = ((_res.options & RES_USE_INET6) ? AF_INET6 : AF_INET);
-
-    return NSS_NAME(gethostbyname3)(name, af, result, buffer, buflen,
+    return NSS_NAME(gethostbyname3)(name, AF_INET, result, buffer, buflen,
                                     errnop, herrnop, NULL, NULL);
 }
 
-- 
2.7.4

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