pep517: drop outdated and unused recipe. (#11937)

Not required on-tree since 5f1c50c8e9.

Users should try to `pip install` this, if they need it.

dev-python/pep517/pep517-0.12.0.recipe

@@ -1,69 +0,0 @@
-SUMMARY="API to call PEP 517 hooks"
-DESCRIPTION="PEP 517 specifies a standard API for systems which build Python packages.
-
-PEP 660 extends it with a build mode that leads to editable installs.
-
-This package contains wrappers around the hooks specified by PEP 517 and
-PEP 660. It provides:
-
-- A mechanism to call the hooks in a subprocess, so they are isolated from the current process.
-- Fallbacks for the optional hooks, so that frontends can call the hooks without checking which \
-are defined."
-HOMEPAGE="https://pypi.org/project/pep517/"
-COPYRIGHT="2017 Thomas Kluyver"
-LICENSE="MIT"
-REVISION="3"
-pypiVersion="0a/65/6e656d49c679136edfba25f25791f45ffe1ea4ae2ec1c59fe9c35e061cd1"
-SOURCE_URI="https://files.pythonhosted.org/packages/$pypiVersion/pep517-0.12.0.tar.gz"
-CHECKSUM_SHA256="931378d93d11b298cf511dd634cf5ea4cb249a28ef84160b3247ee9afb4e8ab0"
-
-ARCHITECTURES="any"
-
-PROVIDES="
-	$portName = $portVersion
-	"
-REQUIRES="
-	haiku
-	"
-
-BUILD_REQUIRES="
-	haiku_devel
-	"
-
-PYTHON_PACKAGES=(python39 python310)
-PYTHON_VERSIONS=(3.9 3.10)
-for i in "${!PYTHON_PACKAGES[@]}"; do
-pythonPackage=${PYTHON_PACKAGES[i]}
-pythonVersion=${PYTHON_VERSIONS[$i]}
-eval "PROVIDES_${pythonPackage}=\"\
-	${portName}_$pythonPackage = $portVersion\
-	\"; \
-REQUIRES_$pythonPackage=\"\
-	haiku\n\
-	cmd:python$pythonVersion\n\
-	tomli_$pythonPackage\
-	\""
-BUILD_REQUIRES="$BUILD_REQUIRES
-	setuptools_$pythonPackage"
-BUILD_PREREQUIRES="$BUILD_PREREQUIRES
-	cmd:python$pythonVersion"
-done
-
-INSTALL()
-{
-	for i in "${!PYTHON_PACKAGES[@]}"; do
-		pythonPackage=${PYTHON_PACKAGES[i]}
-		pythonVersion=${PYTHON_VERSIONS[$i]}
-
-		python=python$pythonVersion
-		installLocation=$prefix/lib/$python/vendor-packages/
-		export PYTHONPATH=$installLocation:$PYTHONPATH
-		mkdir -p $installLocation
-		rm -rf build
-		$python setup.py build install \
-			--root=/ --prefix=$prefix
-
-		packageEntries  $pythonPackage \
-			$prefix/lib/python*
-	done
-}