ldns headers should define socklen_t if required

ldns-socklen_t.diff

Index: configure.ac
===================================================================
--- configure.ac	(revision 3751)
+++ configure.ac	(working copy)
@@ -449,6 +449,11 @@
 fi
 
 ACX_TYPE_SOCKLEN_T
+if test "x$ac_cv_type_socklen_t" = xyes; then
+  AC_SUBST(ldns_build_config_have_socklen_t, 1)
+else
+  AC_SUBST(ldns_build_config_have_socklen_t, 0)
+fi
 AC_TYPE_SIZE_T
 AC_TYPE_SSIZE_T
 AC_TYPE_INTPTR_T
Index: ldns/common.h.in
===================================================================
--- ldns/common.h.in	(revision 3751)
+++ ldns/common.h.in	(working copy)
@@ -23,6 +23,7 @@
 #define LDNS_BUILD_CONFIG_HAVE_INTTYPES_H  @ldns_build_config_have_inttypes_h@
 #define LDNS_BUILD_CONFIG_HAVE_ATTR_FORMAT @ldns_build_config_have_attr_format@
 #define LDNS_BUILD_CONFIG_HAVE_ATTR_UNUSED @ldns_build_config_have_attr_unused@
+#define LDNS_BUILD_CONFIG_HAVE_SOCKLEN_T   @ldns_build_config_have_socklen_t@
 
 /*
  * HAVE_STDBOOL_H is not available when distributed as a library, but no build 
@@ -65,4 +66,8 @@
 #define ATTR_UNUSED(x)  x
 #endif /* !LDNS_BUILD_CONFIG_HAVE_ATTR_UNUSED */
 
+#if !LDNS_BUILD_CONFIG_HAVE_SOCKLEN_T
+typedef int socklen_t;
+#endif
+
 #endif /* LDNS_COMMON_H */