Otherwise it triggers a rebuild of llvm-dependent rust pieces every time rust_runx is called,
lengthening the builds without need.
(From OE-Core rev: aca6b29b508175da9f213b1c6dba5d02a15b8287)
Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>