libmilter: fix build with glibc 2.30

srcpkgs/libmilter/patches/glibc230.patch

@@ -0,0 +1,59 @@
+The former deprecated macro RES_USE_INET6 is gone with glibc 2.30
+
+Source: openSUSE
+
+---
+ libmilter/sm_gethost.c |    6 ++++--
+ sendmail/conf.c        |    6 ++++--
+ 2 files changed, 8 insertions(+), 4 deletions(-)
+
+--- libmilter/sm_gethost.c
++++ libmilter/sm_gethost.c	2019-09-28 07:27:46.512228011 +0000
+@@ -51,18 +51,20 @@ sm_getipnodebyname(name, family, flags,
+ {
+ 	bool resv6 = true;
+ 	struct hostent *h;
+-
++#ifdef RES_USE_INET6
+ 	if (family == AF_INET6)
+ 	{
+ 		/* From RFC2133, section 6.1 */
+ 		resv6 = bitset(RES_USE_INET6, _res.options);
+ 		_res.options |= RES_USE_INET6;
+ 	}
++#endif
+ 	SM_SET_H_ERRNO(0);
+ 	h = gethostbyname(name);
++#ifdef RES_USE_INET6
+ 	if (family == AF_INET6 && !resv6)
+ 		_res.options &= ~RES_USE_INET6;
+-
++#endif
+ 	/* the function is supposed to return only the requested family */
+ 	if (h != NULL && h->h_addrtype != family)
+ 	{
+--- sendmail/conf.c
++++ sendmail/conf.c	2019-09-28 07:28:39.103245002 +0000
+@@ -4242,18 +4242,20 @@ sm_getipnodebyname(name, family, flags,
+ 
+ # else /* HAS_GETHOSTBYNAME2 */
+ 	bool resv6 = true;
+-
++#ifdef RES_USE_INET6
+ 	if (family == AF_INET6)
+ 	{
+ 		/* From RFC2133, section 6.1 */
+ 		resv6 = bitset(RES_USE_INET6, _res.options);
+ 		_res.options |= RES_USE_INET6;
+ 	}
++#endif
+ 	SM_SET_H_ERRNO(0);
+ 	h = gethostbyname(name);
++#ifdef RES_USE_INET6
+ 	if (!resv6)
+ 		_res.options &= ~RES_USE_INET6;
+-
++#endif
+ 	/* the function is supposed to return only the requested family */
+ 	if (h != NULL && h->h_addrtype != family)
+ 	{