Remove the now unnecessary Makefile

In a pure Python project run directly from source we really don't
have a need for a Makefile.  Previously it held the rule to update
the protobuf client from Gerrit1, but now that we have retired that
logic we don't need it anymore.

Signed-off-by: Shawn O. Pearce <sop@google.com>

Makefile

@@ -1,19 +0,0 @@
-#
-# Copyright 2008 Google Inc.
-#
-# 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.
-
-all:
-
-clean:
-	find . -name \*.pyc -type f | xargs rm -f