[clangd] Remove unused bits after 67b2dbd5a33583. NFC

[sammccall]

Summary

I think these are all safe to remove, but this doesn't build for me right now
(https://github.com/clangd/clangd/issues/351) so please verify...

[kbobyrev]

clang-tools-extra/clangd/Features.inc.in

2

I don't know how much code will have with ifdefs in the Clangd itself, but I can think of several places, so I'm not sure whether removing this is really needed (since I'd most likely add this back in the next patch or two). However, I'm OK with doing that, things might change.

The cleanup which will be correct regardless is removing the last implicit remnants of CLANGD_ENABLE_REMOTE from Dexp:

• Features.in include is no longer needed
• CMake's directive to include the directory with Features.in is also no longer needed.

[kbobyrev]

clang-tools-extra/clangd/index/remote/server/Server.cpp

12

This can also be removed.

16

This can be removed.

17

This can be removed.

[sammccall]

Obsoleted by D79313
(Sorry for ignoring this!)

clang-tools-extra/clangd/Features.inc.in

 #define CLANGD_BUILD_XPC @CLANGD_BUILD_XPC@
-#define CLANGD_ENABLE_REMOTE @CLANGD_ENABLE_REMOTE@

clang-tools-extra/clangd/index/remote/Client.cpp

 //===--- Client.cpp ----------------------------------------------*- C++-*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include <grpcpp/grpcpp.h>
 
 #include "Client.h"
 #include "Index.grpc.pb.h"
 #include "Logger.h"
 #include "Trace.h"
 #include "index/Serialization.h"
 #include "marshalling/Marshalling.h"
-#include "llvm/Support/YAMLTraits.h"
 
 namespace clang {
 namespace clangd {
 namespace remote {
 namespace {
 
 class IndexClient : public clangd::SymbolIndex {
   template <typename RequestT, typename ReplyT>

clang-tools-extra/clangd/index/remote/marshalling/Marshalling.h

 //===--- Marshalling.h -------------------------------------------*- C++-*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // Transformations between native Clangd types and Protobuf-generated classes.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_REMOTE_MARSHALLING_H
 #define LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_REMOTE_MARSHALLING_H
 
-#include "Index.grpc.pb.h"
+#include "Index.pb.h"
 #include "index/Index.h"
 #include "llvm/Support/StringSaver.h"
 
 namespace clang {
 namespace clangd {
 namespace remote {
 
 clangd::FuzzyFindRequest fromProtobuf(const FuzzyFindRequest *Request);

clang-tools-extra/clangd/index/remote/server/CMakeLists.txt

 set(LLVM_LINK_COMPONENTS
-  LineEditor
   Support
   )
 add_clang_executable(clangd-index-server
   Server.cpp
   )
 target_compile_definitions(clangd-index-server PRIVATE -D GOOGLE_PROTOBUF_NO_RTTI=1)
 clang_target_link_libraries(clangd-index-server
   PRIVATE
   clangDaemon
   )
 target_link_libraries(clangd-index-server
   PRIVATE
   RemoteIndexProtos
 
   clangdRemoteMarshalling
   )

clang-tools-extra/clangd/index/remote/server/Server.cpp

 //===--- Server.cpp - gRPC-based Remote Index Server  ---------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include "index/Index.h"
 #include "index/Serialization.h"
 #include "index/remote/marshalling/Marshalling.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/StringRef.h"
-#include "llvm/LineEditor/LineEditor.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Signals.h"
 
 #include <grpcpp/grpcpp.h>
 #include <grpcpp/health_check_service_interface.h>
 
 #include "Index.grpc.pb.h"
 
 namespace clang {