Move the PEP-517 back-end bbclass from meta-python to support:
[build-system]
build-backend = "mesonpy"
This is the declared backend in python3-numpy since:
942fb8caf3
(From OE-Core rev: f0d3478913b092a01eceafe0c20378cf9117f429)
Signed-off-by: Tim Orling <tim.orling@konsulko.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
