libxtables: prefix/order - move check_inverse to xtables.c

This also adds a warning that intrapositional negation support
is deprecated.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
diff --git a/extensions/libxt_connlimit.c b/extensions/libxt_connlimit.c
index 117222a..f43eada 100644
--- a/extensions/libxt_connlimit.c
+++ b/extensions/libxt_connlimit.c
@@ -63,7 +63,7 @@
 			exit_error(PARAMETER_PROBLEM,
 				"--connlimit-above may be given only once");
 		*flags |= 0x1;
-		check_inverse(optarg, &invert, &optind, 0);
+		xtables_check_inverse(optarg, &invert, &optind, 0);
 		info->limit   = strtoul(argv[optind-1], NULL, 0);
 		info->inverse = invert;
 		break;