update py-six to 1.15.0

The main benefit of this update is some improved pyton 3.9 support. Tested by building over 100 consumers under python2 and python3 on amd64. No compile-time issues were seen. ok? Index: Makefile === RCS file:

[PATCH 02/11] [update] py-six to 1.15.0

From: Aisha Tammy Signed-off-by: Aisha Tammy --- devel/py-six/Makefile | 3 +-- devel/py-six/distinfo | 4 ++-- 2 files changed, 3 insertions(+), 4 deletions(-) diff --git a/devel/py-six/Makefile b/devel/py-six/Makefile index 544fb827f65..adfd8c05787 100644 --- a/devel/py-six/Makefile +++