[cairo] Patch to make pixman valgrind-happy

[Behdad Esfahbod]

Hi,

Currently pixman dynamically allocates its implementation structures, which
leaves unfreed memory around even when one calls cairo_debug_reset_static_data().

One way to fix that would be to add a pixman_debug_reset_static_data(), and
call that from the cairo one.  That may be overkill though, given that the
attached patch does the trick for now.


Cheers,
behdad
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