cmake/llvm: Improve tool detection
cmake/llvm: Improve tool detection

On Debian, llvm-obj{copy,dump} tools are installed with a version
suffix.  Look first for a version that matches our compiler when
probing for tool paths before trying the bare version, or falling back
to GNU binutils.

Signed-off-by: Andy Ross <61c3cfd4c0060414f91281a789685c974e47d1ec@google.com>

galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr