mesa: initialize ctx->Stencil._BackFace = 1
Back-face stencil operations didn't work correctly because this value was zero. It needs to be 1 or 2. The only place it's set otherwise is in glEnable/Disable(GL_STENCIL_TEST_TWO_SIDE_EXT).
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@ -565,4 +565,5 @@ _mesa_init_stencil(GLcontext *ctx)
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ctx->Stencil.WriteMask[1] = ~0U;
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ctx->Stencil.WriteMask[2] = ~0U;
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ctx->Stencil.Clear = 0;
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ctx->Stencil._BackFace = 1;
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}
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