layer.conf: drop LLVMVERSION

[shr-project]

The recipes were removed from this layer and this version doesn't match with the clang version in oe-core (currently 21.1.7).

Better to drop this variable now as it's just confusing and if someone needs to find a path to clang lib files like:
recipe-sysroot/usr/lib/clang/18.1.6/lib/linux
we need to use some other variable to do that.

scripts/devtool-clang.sh still references this variable, but I guess the script isn't used anymore.

---

Contributor checklist

• Changes have been tested
• Signed-off-by is present
• The PR complies with the Open Embedded Commit Patch Message Guidelines

Reviewer Guidelines

• When submitting a review, please pick:
  • 'Approve' if this change would be acceptable in the codebase (even if there are minor or cosmetic tweaks that could be improved).
  • 'Request Changes' if this change would not be acceptable in our codebase (e.g. bugs, changes that will make development harder in future, security/performance issues, etc).
  • 'Comment' if you don't feel you have enough information to decide either way (e.g. if you have major questions, or you don't understand the context of the change sufficiently to fully review yourself, but want to make a comment)

[kraj]

its still used in scripts/devtool-clang.sh eventhough I doubt the use of this script, it was for using a local development tree of llvm ( mainly for LLVM development) but since it moved to code it might not be relevant anymore. So would you mind sending a patch to remove this script as well ?

[shr-project]

its still used in scripts/devtool-clang.sh eventhough I doubt the use of this script, it was for using a local development tree of llvm ( mainly for LLVM development) but since it moved to code it might not be relevant anymore. So would you mind sending a patch to remove this script as well ?

OK, done.

[kraj]

lgtm