Python 3.7.0 makes 'async' a reserved keyword, but circus uses it as a
method argument. This commit adds a patch to the circus package, which
has been submitted upstream, to resolve this issue.
Fixes:
http://autobuild.buildroot.net/results/8122a00644810722b827cd5e0b90181996dc5657/
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
