Minor, drop java_generic_services option from .proto files

There are no service definitions in our .proto files, so this option had no
effect

core/deserialization/src/descriptors.proto

@@ -19,8 +19,7 @@ package org.jetbrains.kotlin.serialization;
 import "core/deserialization/src/ext_options.proto";
 
 option java_outer_classname = "ProtoBuf";
-option optimize_for = LITE_RUNTIME; // Smaller runtime
-option java_generic_services = false; // Less code
+option optimize_for = LITE_RUNTIME;
 
 message StringTable {
   repeated string string = 1;

core/deserialization/src/ext_options.proto

@@ -1,9 +1,24 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * 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.
+ */
+
 package org.jetbrains.kotlin.serialization;
 
 import "google/protobuf/descriptor.proto";
 
 option java_outer_classname = "ExtOptionsProtoBuf";
-option java_generic_services = false; // Less code
 
 extend google.protobuf.FieldOptions {
   optional bool skip_in_comparison = 50000;