fix autoconf syntax

4d7350f3 · Michael Jerris · 9a1948e9 · 4d7350f3
--- a/libs/ldns/acx_nlnetlabs.m4
+++ b/libs/ldns/acx_nlnetlabs.m4
@@ -781,9 +781,9 @@ AC_LANG_PROGRAM(
 #include <ws2tcpip.h>
 #endif
 ]])],
-[
+[[
        (void)getaddrinfo(NULL, NULL, NULL, NULL);
-]
+]]
 ),
 [
 ac_cv_func_getaddrinfo="yes"