package/python-pep517: migrate setup type to flit

This package is moving to flit and distutils will be removed in a future
release. We need to use flit-bootstrap since host-python-pypa-build
depends on host-python-pep517.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/python-pep517/python-pep517.mk

@@ -9,7 +9,7 @@ PYTHON_PEP517_SOURCE = pep517-$(PYTHON_PEP517_VERSION).tar.gz
 PYTHON_PEP517_SITE = https://files.pythonhosted.org/packages/0a/65/6e656d49c679136edfba25f25791f45ffe1ea4ae2ec1c59fe9c35e061cd1
 PYTHON_PEP517_LICENSE = MIT
 PYTHON_PEP517_LICENSE_FILES = LICENSE
-PYTHON_PEP517_SETUP_TYPE = distutils
+PYTHON_PEP517_SETUP_TYPE = flit-bootstrap
 HOST_PYTHON_PEP517_DEPENDENCIES = host-python-tomli
 
 $(eval $(host-python-package))