Clear repo

To be able to perform the migration, we need to start from an empty directory/repo.

vendor/github.com/prometheus/procfs/Makefile

@@ -1,29 +0,0 @@
-# Copyright 2018 The Prometheus Authors
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-# http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-include Makefile.common
-
-%/.unpacked: %.ttar
-	@echo ">> extracting fixtures"
-	./ttar -C $(dir $*) -x -f $*.ttar
-	touch $@
-
-update_fixtures:
-	rm -vf fixtures/.unpacked
-	./ttar -c -f fixtures.ttar fixtures/
-
-.PHONY: build
-build:
-
-.PHONY: test
-test: fixtures/.unpacked common-test