clang: Set -DLLVM_APPEND_VC_REV=OFF

Fixes Issue #991

If this is not disabled, the build tries to use CMake magic to compute
repository and sha1 its building, however in case of OE it gets it
completely wrong when building from tarball, because its building under
TMPDIR which maybe a directory under main repo checkout e.g. poky tree
so it traverses up and finds the sha of poky and assumes that its building
from a git tree instead of tarball and emits the version control info into
clang -v output e.g.

❯ ../image/mnt/b/yoe/master/build/tmp/work/x86_64-linux/clang-native/20.0.0/recipe-sysroot-native/usr/bin/clang -v
clang version 20.0.0 (/home/kraj/work/llvm-project f133c59b33a749dc6d5fa8fb9a2366b95ea45068)

This can contain buildpaths since work-shared is where llvm sources will be and they
will appear here.

Therefore, avoid cmake trying to do this and we get good clean version info

> ../recipe-sysroot-native/usr/bin/aarch64-yoe-linux/aarch64-yoe-linux-clang
clang version 20.0.0

This will also avoid emitting buildpaths into debuginfo in some cases where
compiler version is emitted into build.id info

Signed-off-by: Khem Raj <raj.khem@gmail.com>

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