dev-python/pure-protobuf: remove unused patch(es)

Signed-off-by: Michael Mair-Keimberger <mmk@levelnine.at>

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

@@ -1,13 +0,0 @@
-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"',