Turned off the need_dh flag for testing and forgot to turn it back on

configure.ac

@@ -307,7 +307,7 @@ AC_ARG_ENABLE([ssl],
 dnl Optional SSL library and include paths
 if test x$check_for_ssl = xyes; then
 	# need_dh should only be set for NRPE
-	need_dh=no
+	need_dh=yes
 	AC_NAGIOS_GET_SSL
 fi