dev-python/pip: remove unused patch

Package-Manager: Portage-2.3.96, Repoman-2.3.22
Signed-off-by: Michael Mair-Keimberger <m.mairkeimberger@gmail.com>
Signed-off-by: Aaron Bauman <bman@gentoo.org>

dev-python/pip/files/pip-19.3.1-disable-system-install.patch

@@ -1,17 +0,0 @@
-install: Raise an error to avoid breaking python-exec
-
-Running pip without --target, --root, or --user will result in packages
-being installed systemwide. This has a tendency to break python-exec if
-setuptools gets installed or upgraded.
-
---- pip-19.1/src/pip/_internal/commands/install.py
-+++ pip-19.1/src/pip/_internal/commands/install.py
-@@ -246,6 +246,9 @@ class InstallCommand(RequirementCommand):
-         if options.upgrade:
-             upgrade_strategy = options.upgrade_strategy
-
-+        if not any((options.use_user_site, options.target_dir, options.root_path, options.prefix_path)):
-+            raise CommandError("(Gentoo) Please run pip with the --user option to avoid breaking python-exec")
-+
-         if options.build_dir:
-             options.build_dir = os.path.abspath(options.build_dir)