gbproxy: Kill the global gbprox_global_patch_state struct

Move this patching state into the gbproxy_config as well.

Done by Jacob
diff --git a/openbsc/tests/gbproxy/gbproxy_test.c b/openbsc/tests/gbproxy/gbproxy_test.c
index 63daaff..3abc14e 100644
--- a/openbsc/tests/gbproxy/gbproxy_test.c
+++ b/openbsc/tests/gbproxy/gbproxy_test.c
@@ -951,7 +951,7 @@
 	configure_bss_peers(bss_peer, ARRAY_SIZE(bss_peer));
 
 	gbcfg.match_re = talloc_strdup(NULL, "^9898|^121314");
-	if (gbprox_set_patch_filter(gbcfg.match_re, &err_msg) != 0) {
+	if (gbprox_set_patch_filter(&gbcfg, gbcfg.match_re, &err_msg) != 0) {
 		fprintf(stderr, "Failed to compile RE '%s': %s\n",
 			gbcfg.match_re, err_msg);
 		exit(1);