FreeBSD compatibility fixes

EAI_NODATA has been made obsolete.
Properly detect MD5Init in -lmd

config.patch

@@ -1,5 +1,5 @@
---- config.orig	2014-12-28 12:15:23.139241646 -0600
-+++ config.c	2014-12-28 12:15:58.843242420 -0600
+--- config.orig	Sun Dec 28 20:17:46 2014
++++ config.c	Sun Dec 28 20:19:48 2014
 @@ -75,7 +75,9 @@
  	if ((h = calloc(1, sizeof(struct ntp_addr))) == NULL)
  		fatal(NULL);
@@ -20,7 +20,24 @@
  		sa_in6->sin6_family = AF_INET6;
  		memcpy(&sa_in6->sin6_addr,
  		    &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr,
-@@ -141,12 +145,16 @@
+@@ -124,8 +128,14 @@
+ 	hints.ai_family = PF_UNSPEC;
+ 	hints.ai_socktype = SOCK_DGRAM; /* DUMMY */
+ 	error = getaddrinfo(s, NULL, &hints, &res0);
+-	if (error == EAI_AGAIN || error == EAI_NODATA || error == EAI_NONAME)
+-			return (0);
++	switch (error) {
++	case EAI_AGAIN:
++#ifdef EAI_NODATA
++	case EAI_NODATA:
++#endif
++	case EAI_NONAME:
++		return (0);
++	}
+ 	if (error) {
+ 		log_warnx("could not parse \"%s\": %s", s,
+ 		    gai_strerror(error));
+@@ -141,12 +151,16 @@
  		h->ss.ss_family = res->ai_family;
  		if (res->ai_family == AF_INET) {
  			sa_in = (struct sockaddr_in *)&h->ss;

configure.ac

@@ -93,7 +93,8 @@ AC_CHECK_FUNC([ibuf_open],,
 
 # Share test results with automake
 AM_CONDITIONAL([HAVE_ADJFREQ], [test "x$ac_cv_func_adjfreq" = xyes])
-AM_CONDITIONAL([HAVE_ARC4RANDOM], [test "x$ac_cv_func_arc4random" = xyes])
+AM_CONDITIONAL([HAVE_ARC4RANDOM],
+	[test "x$ac_cv_func_arc4random" = xyes -o "ac_cv_search_arc4random" != xno])
 AM_CONDITIONAL([HAVE_ARC4RANDOM_UNIFORM], [test "x$ac_cv_func_arc4random_uniform" = xyes])
 AM_CONDITIONAL([HAVE_ASPRINTF], [test "x$ac_cv_func_asprintf" = xyes])
 AM_CONDITIONAL([HAVE_EXPLICIT_BZERO], [test "x$ac_cv_func_explicit_bzero" = xyes])
@@ -108,7 +109,8 @@ AM_CONDITIONAL([HAVE_STRLCPY], [test "x$ac_cv_func_strlcpy" = xyes])
 AM_CONDITIONAL([HAVE_STRNDUP], [test "x$ac_cv_func_strndup" = xyes])
 AM_CONDITIONAL([HAVE_STRNLEN], [test "x$ac_cv_func_strnlen" = xyes])
 AM_CONDITIONAL([HAVE_STRTONUM], [test "x$ac_cv_func_strtonum" = xyes])
-AM_CONDITIONAL([HAVE_MD5], [test "x$ac_cv_func_MD5Init" = xyes])
+AM_CONDITIONAL([HAVE_MD5],
+	[test "x$ac_cv_func_MD5Init" = xyes -o "ac_cv_search_MD5Init" != xno])
 AM_CONDITIONAL([HAVE_SHA512], [test "x$ac_cv_func_SHA512Init" = xyes])
 AM_CONDITIONAL([HAVE_IMSG], [test "x$ac_cv_func_ibuf_open" = xyes])