The OSAtomicAdd32Barrier operator returns the new value, we want the
old value.

We need this to set data on objects safely without worrying that some
other thread unsets it by setting it at the same time.

Where causing issues for people with MSVC.

Looks *so* much nicer!

Buffer debugging coming soon.

All good now.

More intuitive.

Mutex (and Windows.h by extension) are fairly isolated now.

Fixes problem with uninitialized sub_blob->mutex among other things.

Reported by Bradley Grainger.

Based on patch by Bradley Grainger.

Makes way for adding arbitrary user_data support.

So we can liberally use the simple features of C++ that parts of the
codebase is already using.

This was a bizzare piece of API that I inherited from cairo.  It has
been wrong adding them to cairo in the first place.  Remove them before
someone uses them!

This is the common convention for language binding tools.

Ugly :(.

Such that we don't break debug build all the time.

GNOME Bug 604128 - Applications crash when displaying Hebrew characters