wic: use shutil.which
Use shutil.which to find the executable instead to silence the below warning:
$ cat tmp/work/intel_x86_64-poky-linux/core-image-base/1.0-r5/temp/log.do_image_wic
[snip]
DEBUG: Executing shell function do_image_wic
/path/layers/oe-core/scripts/wic:27: DeprecationWarning: The distutils package is deprecated and slated for removal in Python 3.12. Use setuptools or check PEP 632 for potential alternatives
from distutils import spawn
INFO: Creating image(s)...
[snip]
[RP: Added conversion for missed function reference]
Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit
3966cbf5c8a2dbc3a4f0f3eefdbeeb83f522bf87)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
