[bug#49794] [PATCH core-updates-frozen] fix mesa-opencl and mesa-opencl-icd build failure

[John Kehayias]

Hello,

Attached is a patch to fix failures for mesa-opencl and mesa-opencl-icd 
building with the update to 21.1.6 for Mesa. This is from upstream, a change in 
meson.build that removed LLVM targets (for CMake users it seems) but then 
breaks compilation for us on a shared library LLVM build.

https://gitlab.freedesktop.org/mesa/mesa/-/issues/4443

https://gitlab.freedesktop.org/mesa/mesa/-/issues/4302

And the commit that changed it: 
https://gitlab.freedesktop.org/mesa/mesa/-/commit/80817b6e344258ac9b955f824ebf9019a0fc1610

The patch restores 'all-targets' to llvm_modules and successfully builds. 
Apologies about the long line and I'm still guessing at some of the scheme 
patching code. Since Mesa takes a while to build I didn't want to go through 
many iterations to get the code cleaner. Please feel free to make it better, 
and I would think mesa-opencl-icu should be able to inherit the patch from 
mesa-opencl, but I didn't try to do that.

Thanks,
John

0001-gnu-mesa-fix-mesa-opencl-and-mesa-opencl-icd-21.1.6.patch
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