dev-lang/python-oem: use python from python-build-standalone project

Our python-oem is minimal and doesn't support pip or most of the standard
library. This is an attempt to see whether using a prebuilt python
distribution works to support Azure extensions.

It was necessary to add a symlink to 'python' executable and lib64 dir to avoid
having to change distro-oem and waagent ebuilds.

dev-lang/python-oem/Manifest

@@ -1,3 +1,2 @@
-DIST Python-3.9.12.tar.xz 19740524 BLAKE2B 05f2469aa53ca36221ef4976b17bfde3e5b86afd5a8114e5a7fd899f975a8e55022555ef718d5352ab68de1b7b23865a0bf713768c9c2b30d591438c9a396d25 SHA512 081981901e14149748fd35228db0b3b1d96fef227ae7404f07b8bad0fda4b02649bf31c348c94aefdaf3327565d78f9489437c2c02f647b15d41376a27a23e97
-DIST Python-3.9.12.tar.xz.asc 833 BLAKE2B 33436d0404a643215a8fd2b967ffd216201da24f374941bf65b888159ccfabcbe79b751eca2dd489b06605604338c8bbaab74aa10abbe4bcffaa54236301228e SHA512 dddaa27f8a29034f458edb6739398a5455c87fe37b6349e161865a9deedca118ffe9cb82663cc75bbe60b3b556399c0c6855f5262aac1fe90d36a3694fca65b2
-DIST python-gentoo-patches-3.9.12.tar.xz 12848 BLAKE2B 5dd66fa94b136a463d2c4be3a5b7dfad770c3905467a1d81af02a35b2783ce7d614881c915ee8f8e764c1656963d6886d9c60c6e524f512e1bc496e42d01307b SHA512 07de63e47a8e547724099062239df8fcfd254f19d38be28131e6bbb094ffbab8483861fb6a5905e60d7fa7a1a5dc06785951fa31984ecad89516b0b742c47f91
+DIST cpython-3.9.11+20220318-aarch64-unknown-linux-gnu-install_only.tar.gz 86614999 BLAKE2B a76cfaff74f52c30afeee4082fbf17f2beb9660e2240bd75a0bb97f7e76bb7de88664d87cfdfbec09dcf1638929c42bb0a1750a0ebd963c5a86b0efa6ff3b66d SHA512 0eb13bbe1c52a129c5a45824a5dd5be53a607257bf5e4cfbec3998e6ba113d4d0fd35e086117b3be3632109052111cab437dc80ad085b3122e1d13afa095a08e
+DIST cpython-3.9.11+20220318-x86_64_v2-unknown-linux-gnu-install_only.tar.gz 51943652 BLAKE2B ae7ad6cb41b3d91e61989c20f120729319c42542a65b0b1c2e1a499a5f04adb1c0892c5d9e5e61ba196acde40c3a11cb83e379141a411bb47e60ccc7f3e28af0 SHA512 325504f94f5f51930a15799777e50ffb0d42eb1f074414d7281e681d04ee621a5d82978255b00fa3054240908b2ccae00c6f853261ef3c87a54fdd95cb18cad2

dev-lang/python-oem/python-oem-3.9.11.ebuild

@@ -0,0 +1,32 @@
+# Copyright 2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+DESCRIPTION="This project produces self-contained, highly-portable Python distributions."
+HOMEPAGE="https://github.com/indygreg/python-build-standalone/"
+SRC_URI="
+	amd64? ( https://github.com/indygreg/python-build-standalone/releases/download/20220318/cpython-3.9.11+20220318-x86_64_v2-unknown-linux-gnu-install_only.tar.gz )
+	arm64? ( https://github.com/indygreg/python-build-standalone/releases/download/20220318/cpython-3.9.11+20220318-aarch64-unknown-linux-gnu-install_only.tar.gz )
+"
+PYVER=$(ver_cut 1-2)
+
+# TODO: many more licenses are needed
+LICENSE="PSF-2"
+SLOT="${PYVER}"
+KEYWORDS="amd64 arm64"
+
+# TODO: minimal host dependencies, may be we can express those?
+DEPEND=""
+RDEPEND="${DEPEND}"
+BDEPEND=""
+
+S="${WORKDIR}"
+
+src_install() {
+	dodir /usr/share/oem
+	cp -a ${S}/python ${ED}/usr/share/oem
+	find ${ED} -name 'lib*.a' -delete
+	dosym python3 /usr/share/oem/python/bin/python
+	dosym lib /usr/share/oem/python/lib64
+}