That commit removed the include of Features.inc from ClangdLSPServer.h,
but ClangdMain.cpp relied on this include to pull in Features.inc for
the #if at the bottom of Transport.h.
Since the include is needed in Transport.h, just add it to there
directly.
#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_TRANSPORT_H_
#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_TRANSPORT_H_
+#include "Features.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/JSON.h"
#include "llvm/Support/raw_ostream.h"