bitbake: fetch: don't use shell=True when listing ar files

(Bitbake rev: ff2e5d435046886791551587a0988f21ddfe6e2a)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/fetch2/__init__.py

@@ -1469,7 +1469,7 @@ class FetchMethod(object):
                 else:
                     cmd = 'rpm2cpio.sh %s | cpio -id' % (file)
             elif file.endswith('.deb') or file.endswith('.ipk'):
-                output = subprocess.check_output('ar -t %s' % file, preexec_fn=subprocess_setup, shell=True)
+                output = subprocess.check_output(['ar', '-t', file], preexec_fn=subprocess_setup)
                 datafile = None
                 if output:
                     for line in output.decode().splitlines():