dev-python/pure-protobuf: patch exclude variable in setup.py

we used the python_foreach_impl function wrong

python_install is already run with python_foreach_impl,
thus the function should not be used inside python_install

for this there is python_install_all, but this is run after
python_foreach_impl python_install so we again get the
'${P} installs tests' error. Instead I just patched
a fix, this fix is also already in upstream master

Package-Manager: Portage-2.3.99, Repoman-2.3.22
Signed-off-by: Andrew Ammerlaan <andrewammerlaan@riseup.net>

dev-python/pure-protobuf/files/pure-protobuf-do-not-install-tests.patch

@@ -0,0 +1,13 @@
+diff --git a/setup.py b/setup.py
+index deb6c95..2ae6c69 100644
+--- a/setup.py
++++ b/setup.py
+@@ -9,7 +9,7 @@ setup(
+     author='Pavel Perestoronin',
+     author_email='eigenein@gmail.com',
+     url='https://github.com/eigenein/protobuf',
+-    packages=find_packages(exclude=['tests']),
++    packages=find_packages(exclude=['tests*']),
+     zip_safe=True,
+     install_requires=[
+         'dataclasses>=0.6,<1.0; python_version < "3.7"',