[PATCH guile-cairo] cairo-mask-surface() expects wrong number of arguments

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Hi everyone.

I've noticed that guile-cairo's cairo-mask-surface() expects 2 arguments
instead of 4. I came up with a patch.

Apply it with: `patch guile-cairo/guile-cairo.c guile-cairo.c.patch`

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812c812
< SCM_DEFINE_PUBLIC (scm_cairo_mask_surface, "cairo-mask-surface", 2, 0, 0,
---
> SCM_DEFINE_PUBLIC (scm_cairo_mask_surface, "cairo-mask-surface", 4, 0, 0,

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