fixup! component/systemd: Update MarkupSafe version

The version of MarkupSafe must be chosen depending on the version of
Python that runs the 'pip' subprocess, and not the current 'buildout'
process.

This makes a difference when e.g. buildout runs with Python 2, because
[python3] defaults to Python 3.8+ and we want to install the recent
MarkupSafe version (even if Python 2 can only install the old one).

component/systemd/buildout.cfg

@@ -12,36 +12,19 @@ extends =
   ../ninja/buildout.cfg
   ../meson/buildout.cfg
 
-[systemd-markupsafe-download]
-recipe = slapos.recipe.build:download
-shared = true
-url = https://files.pythonhosted.org/packages/bf/10/ff66fea6d1788c458663a84d88787bae15d45daa16f6b3ef33322a51fc7e/${:filename}
-filename = MarkupSafe-2.0.1.tar.gz
-md5sum = 892e0fefa3c488387e5cc0cad2daa523
-
-[systemd-markupsafe-download:sys.version_info < (3,8)]
-url = https://files.pythonhosted.org/packages/4d/de/32d741db316d8fdb7680822dd37001ef7a448255de9699ab4bfcbdf4172b/${:filename}
-filename = MarkupSafe-1.0.tar.gz
-md5sum = 2fcedc9284d50e577b5192e8e3578355
-
-[systemd-jinja2-download]
-recipe = slapos.recipe.build:download
-shared = true
-url = https://files.pythonhosted.org/packages/4f/e7/65300e6b32e69768ded990494809106f87da1d436418d5f1367ed3966fd7/${:filename}
-filename = Jinja2-2.11.3.tar.gz
-md5sum = 231dc00d34afb2672c497713fa9cdaaa
-
 [systemd-python]
 recipe = slapos.recipe.build
 shared = true
-markupsafe = ${systemd-markupsafe-download:target}
-jinja2 = ${systemd-jinja2-download:target}
+eggs =
+  Jinja2 ==2.11.3
+  MarkupSafe ==2.0.1; python_version>='3.8'
+  MarkupSafe ==1.0; python_version<'3.8'
 
 install =
   import os
   call([options['python'], '-m', 'venv', '--clear', location])
   pip = os.path.join(location, 'bin', 'pip')
-  call([pip, 'install', '--no-index', options['markupsafe'], options['jinja2']])
+  call([pip, 'install'] + options['eggs'].splitlines())
   call([pip, 'uninstall', '-y', 'pip', 'setuptools'])
   # selftest
   python = os.path.join(location, 'bin', 'python3')