[cairo] patch to make fdclock build

[Evan Martin]

Attached is a patch to fdclock to make it build on my system.  Mostly
fixes to use the new cairo_set_source_rgba.

There's one suspicious change: around line 100 of fdclock.c there was
a call to set_alpha without a corresponding call to set_rgb_color. 
It's just before the temporary surface is  to the back surface.  Is
the source color used here?  I picked (1,1,1) and it seems to work but
I don't know if my setup triggers that code path.
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