TaskList: use new Startup Notification API

The startup-notification API was recently fixed to use pointers to 'time_t'
instead of pointers to 'long' in the functions
sn_startup_sequence_get_initiated_time() and
sn_startup_sequence_get_last_active_time(). See
http://cgit.freedesktop.org/startup-notification/commit/?id=a7e49fefde18ea8d5bada8096d32f23bcfb5a6dc
This is necessary for correct operation on 32bit platforms that use 64bit
time_t (e.g. OpenBSD >= 5.5, Linux x32 ABI).

Unfortunately, it is unknown if or when a new startup-notification release
containing this patch will be made. Until this situation clears up, downstream
distributions might or might not choose to apply the above patch to
startup-notification.

If startup-notification is patched, or a new release containing the patch is
made, then libwnck needs the attached patch to avoid corruption of stack
variables on 32bit platforms if startup-notifications are enabled.
Release: 3.4.8
Release: post-release bump to 3.4.9
TaskList: remove new Startup Notification API

This patch has not been yet publicly released, thus it's not safe to apply
this in master. It's better to leave distributors the choice weather to use or
not use it.
Release: 3.4.9
Release: post-release bump to 3.4.10
Updated Bengali (India) translation
xutils: Support non-standard depths for icon pixmaps

Currently the presumption is that applications assign a Pixmap for their
icon image using the default visual for the screen, or as an A1 bitmap
for the icon mask. At least SDL doesn't conform to this rule and always
uses 32-bit ARGB Pixmaps. This cases the XCopyArea used by Cairo to grab
the image surface from the Pixmap to fail as the source Pixmap and the
cairo surface are of different depths and triggers a BadMatch - killing
libwnck and its client gnome-shell/gala et al. So as a fallback, if the
depth does not match the visual of the root window, we presume that it
is in a standard XRenderPictFormat and create a cairo surface of the
appropriate depth - instead of crashing, we may just get a weirdly
coloured icon.

Bugzilla: https://bugzilla.gnome.org/show_bug.cgi?id=736817
Cc: Marco Trevisan (Treviño) <mail@3v1n0.net>
Cc: Benjamin Otte <otte@redhat.com>
Updated Bengali (India) translation