tui: create NMClient instance via async init

Using sync init (nm_client_new()) has an overhead as it requires an internal
GMainContext to ensure preserving the order of D-Bus messages. Let's avoid
that by using the async init. Note that the difference here is that we will
iterate the caller's GMainContext while creating the instance. But that
is no problem for nmtui at that point.

Makefile.am

@@ -4640,6 +4640,7 @@ clients_tui_nmtui_LDADD = \
 	clients/tui/newt/libnmt-newt.a \
 	clients/common/libnmc.la \
 	clients/common/libnmc-base.la \
+	shared/nm-libnm-aux/libnm-libnm-aux.la \
 	shared/nm-libnm-core-aux/libnm-libnm-core-aux.la \
 	shared/nm-libnm-core-intern/libnm-libnm-core-intern.la \
 	shared/nm-glib-aux/libnm-glib-aux.la \

clients/tui/meson.build

@@ -51,6 +51,7 @@ deps = [
   libnmc_base_dep,
   libnmc_dep,
   libnmt_newt_dep,
+  libnm_libnm_aux_dep,
 ]
 
 executable(

clients/tui/nmtui.c

@@ -18,6 +18,8 @@
 #include <locale.h>
 #include <stdlib.h>
 
+#include "nm-libnm-aux/nm-libnm-aux.h"
+
 #include "nmt-newt.h"
 #include "nm-editor-bindings.h"
 
@@ -231,8 +233,10 @@ main (int argc, char **argv)
 
 	nm_editor_bindings_init ();
 
-	nm_client = nm_client_new (NULL, &error);
-	if (!nm_client) {
+	if (!nmc_client_new_waitsync (NULL,
+	                              &nm_client,
+	                              &error,
+	                              NULL)) {
 		g_printerr (_("Could not contact NetworkManager: %s.\n"), error->message);
 		g_error_free (error);
 		exit (1);