Hi,

while working on OpenShadingLanguage build issues, I noticed a dependency issue
with
the new clang-tools package.

OSL cannot be compiled with LLVM 16 for now, therefore I forced the deps for TW
to:

BuildRequires:  clang15-devel
BuildRequires:  llvm15-devel

but build drags in clang-tools anyway, which in turn depends on clang16,
rendering
the clang15 containment ineffective.

This results in strange errors like:

> [   34s] /usr/bin/llvm-as: /home/abuild/rpmbuild/BUILD/OpenShadingLanguage-1.12.10.0/build/src/liboslexec/llvm_ops_host_rs.s:13285:79: error: unterminated attribute group
> [   34s] attributes #0 = { alwaysinline mustprogress nofree nosync nounwind willreturn memory(none) uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
> [   34s]                                                                               ^

requiring me to deliberately add a:

#!BuildIgnore:  clang-tools

You will find this build here:

https://build.opensuse.org/package/show/home:frispete:blender/OpenShadingLanguage

I do think, that the build ignore shouldn't be required here.

A similar fix was required by:

https://build.opensuse.org/package/show/home:frispete:blender/ispc