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rusticl: Build Panfrost

Alyssa Rosenzweig requested to merge alyssa/mesa:rusticl-build-panfrost into main

Rusticl + Panfrost is not yet conformant on any supported hardware. However, with the fixes in !22228 (merged), Mali-G57 will be pretty close. The main blocker to passing CTS is missing support for preemption in the kernel. Likely that support will be added to pancsf so we can get conformant OpenCL on Mali-G610 via essentially the same userspace, but that's a little while out.

In the mean time, let's build Panfrost with Rusticl so advanterous Mali-G57 users can experiment. This still needs the magic environment variable set, of course, so this shouldn't cause harm to any existing users.

Cc @karolherbst

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