Fix a GUI segfault in 64-bit Windows #1076
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It is not possible to use [GdkPixbuf.get_pixels] as it will crash on 64-bit Windows. It is not possible to use [GdkPixbuf.from_data] with most backing buffers (for example those based on string/bytes) as GC may cause those to move around in memory, thus breaking the pixbuf. The current assumption is that due to the implementation of [Bigarray] its data buffer is allocated in C and not moved around by GC, thus suitable to use with [GdkPixbuf.from_data]. However, as a trade-off, creating a [Gpointer.region] based on a [Bigarray] does make this code dependent on internal implementation details of [Bigarray]. This patch uses a custom function for creating a [Gpointer.region] of a [Bigarray] as [Gpointer.region_of_bigarray] is even more tightly bound to internal implementation details of [Bigarray].
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