meson: define llvm-config for cross-compiling
This leads to another breakage, because intel-clc cannot be cross-compiled.
However, with LLVM required for i386, this binary must be specified.
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
This leads to another breakage, because intel-clc cannot be cross-compiled.
However, with LLVM required for i386, this binary must be specified.