new package py3_build (#7100)

new package py3_installer

new package py3_pep517

new package py3_tomli

add new buildsystem to buildessential

add constants to const.rb for new buildsystem

new package py3_flit_core

new package py3_flit

add py3_flit_core to buildessential

new package py3_tomli_w

add x86_64 and i686 binaries

fix flit-core and tomli-w binaries

bump crew version

update pyparsing and packaging

oops py3_packaging depends on py3_pyparsing (add x86_64 and i686 binaries)

py3_pyparsing does not depend on itself

add arm binaries

packages/py3_flit.rb

@@ -0,0 +1,38 @@
+require 'package'
+
+class Py3_flit < Package
+  description 'Flit provides simplified packaging of Python modules.'
+  homepage 'https://flit.pypa.io/'
+  @_ver = '3.7.1'
+  version @_ver
+  license 'MIT'
+  compatibility 'all'
+  source_url 'https://github.com/pypa/flit.git'
+  git_hashtag @_ver
+
+  binary_url({
+    aarch64: 'https://gitlab.com/api/v4/projects/26210301/packages/generic/py3_flit/3.7.1_armv7l/py3_flit-3.7.1-chromeos-armv7l.tar.zst',
+     armv7l: 'https://gitlab.com/api/v4/projects/26210301/packages/generic/py3_flit/3.7.1_armv7l/py3_flit-3.7.1-chromeos-armv7l.tar.zst',
+       i686: 'https://gitlab.com/api/v4/projects/26210301/packages/generic/py3_flit/3.7.1_i686/py3_flit-3.7.1-chromeos-i686.tar.zst',
+     x86_64: 'https://gitlab.com/api/v4/projects/26210301/packages/generic/py3_flit/3.7.1_x86_64/py3_flit-3.7.1-chromeos-x86_64.tar.zst'
+  })
+  binary_sha256({
+    aarch64: '0d3d6d84c6086b31bd4e1aadcb507c5492ab87e64dc866e1064343c6fa1e82ec',
+     armv7l: '0d3d6d84c6086b31bd4e1aadcb507c5492ab87e64dc866e1064343c6fa1e82ec',
+       i686: '33b26c11c228eea59b6723633f057171930731b3cc653f864eea093ebd79732f',
+     x86_64: 'ca2b38b085a2bb35d5a42daa20209c15cf94b613eea6ecadd2f4c78afc1ee655'
+  })
+
+  depends_on 'py3_docutils'
+  depends_on 'py3_flit_core'
+  depends_on 'py3_tomli'
+  depends_on 'py3_tomli_w'
+
+  def self.build
+    system "python3 -m build #{PY3_BUILD_OPTIONS}"
+  end
+
+  def self.install
+    system "python3 -m installer #{PY3_INSTALLER_OPTIONS}"
+  end
+end