Mask all signals in GLib worker thread

Some code using GLib (gnome-keyring-daemon, for example) assumes that
they can catch signals by masking them out in the main thread and
calling sigwait() from a worker.

The problem is that our new worker thread catches the signals before
sigwait() has a chance and the default action occurs (typically
resulting in program termination).

If we mask all the signals in our worker, then this can't happen.

docs/reference/glib/tmpl/macros_misc.sgml

@@ -467,6 +467,21 @@ Since: 2.14
 
 
 
+<!-- ##### MACRO G_DEPRECATED ##### -->
+<para>
+
+</para>
+
+
+
+<!-- ##### MACRO G_DEPRECATED_FOR ##### -->
+<para>
+
+</para>
+
+@f: 
+
+
 <!-- ##### MACRO G_LIKELY ##### -->
 <para>
 Hints the compiler that the expression is likely to evaluate to a true