add lxml (#5088)

packages/lxml.rb

+require 'package'
+
+class Lxml < Package
+  description 'Library for processing XML and HTML in the Python language.'
+  homepage 'https://lxml.de/'
+  version '4.6.1'
+  compatibility 'all'
+  source_url 'file:///dev/null'
+  source_sha256 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855'
+
+  binary_url({
+    aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/lxml-4.6.1-chromeos-armv7l.tar.xz',
+     armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/lxml-4.6.1-chromeos-armv7l.tar.xz',
+       i686: 'https://dl.bintray.com/chromebrew/chromebrew/lxml-4.6.1-chromeos-i686.tar.xz',
+     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/lxml-4.6.1-chromeos-x86_64.tar.xz'
+  })
+  binary_sha256({
+    aarch64: 'c9b3bfe7891b89b124260f2fd7ac276060649922c9010b4287a13d18deb98c91',
+     armv7l: 'c9b3bfe7891b89b124260f2fd7ac276060649922c9010b4287a13d18deb98c91',
+       i686: '17ec2f74f7bb91b6cb81d8a58f62328e87002ded622ecc7d2d5216c9fc35139f',
+     x86_64: '1951efc4cf2ad7b13fc33f5a8f89e49e5b52e117ca980819ed6ba0c58bbb16d6'
+  })
+
+  def self.install
+    system 'pip3 uninstall -y lxml'
+    system "pip3 install --upgrade --no-warn-script-location lxml --prefix #{CREW_PREFIX} --root #{CREW_DEST_DIR}"
+  end
+end