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ac/llvm: export ac_init_llvm_once in targets

Pierre-Eric Pelloux-Prayer requested to merge pepp/mesa:ac_fix_llvm_init_once into master

If a program like mpv uses both radeon_dri.so (because --vo=gpu) and radeonsi_drv_video.so (because --hwdec=vaapi) then LLVM will be inialized twice.

The commit exports the ac_init_llvm_once so there's only one instance of the function and once_flag variable.

See also 18b12bf5 ("targets: export radeon winsys_create functions to silence LLVM warning") which implemented this workaround initially.

Closes: #1377 (closed)

Edited by Pierre-Eric Pelloux-Prayer

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