[FFmpeg-devel] Patch: Enable OpenCL with Win32 threads

[Matt Oliver]

Heres a different version that doesnt require some win32 black magic. I
used the existing init flag as an atomic flag to correctly initialise the
mutex on first use. There was already several checks on the init flag in
various functions so this doesnt add much apart from changing those to
atomics. This new patch will work with pthread/win32/os2.

There are 2 parts to the patch. The first adds an extra atomic function for
32b compare and exchange (the existing pointer version obviously wouldnt
work in 64b). The second part is the changes to opencl itself.
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