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Trace does its own checking, and it used the GALLIUM_TRACE variable
as well, but expected a file and not a bool argument.
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This reverts commit f87a5f6499f51f651c2a9f2d4682875b22926905.
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This was a good idea, but ended up tying the build systems in knots.
We can revisit this later, in particular if we can put in place dummy
implementations of cell_create_screen(), llvmpipe_create_screen()
which just return NULL if the driver isn't available.
In the meantime, just duplicate this smallish function in the two
places it was being called.
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Add a helper gallium_wrap_screen() for injecting the commonly
used extra layers into a gallium stack. Currently that's just the
trace module and identity layer, but there could be more in the
future, eg. a validation layer.
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