test/*: remove GLib logging setup

Obsolete, our logging library doesn't ues GLib anymore.

test/DumpDatabase.cxx

@@ -39,16 +39,6 @@ using std::endl;
 
 #include <stdlib.h>
 
-static void
-my_log_func(const gchar *log_domain, gcc_unused GLogLevelFlags log_level,
-	    const gchar *message, gcc_unused gpointer user_data)
-{
-	if (log_domain != NULL)
-		g_printerr("%s: %s\n", log_domain, message);
-	else
-		g_printerr("%s\n", message);
-}
-
 static bool
 DumpDirectory(const Directory &directory, Error &)
 {
@@ -94,8 +84,6 @@ main(int argc, char **argv)
 	g_thread_init(nullptr);
 #endif
 
-	g_log_set_default_handler(my_log_func, nullptr);
-
 	/* initialize MPD */
 
 	config_global_init();