message: Resurrect LLDB Standalone build on NetBSD
  Include CheckIncludeFile for check_include_file() in CMake.
  Detect <sys/event.h> in CMake.
  This header is available on NetBSD.
diff: @@ -433,7 +433,9 @@ endif()
  find_package(Backtrace)
  +include(CheckIncludeFile)
  check_include_file(termios.h HAVE_TERMIOS_H)
  +check_include_file(sys/event.h HAVE_SYS_EVENT_H)
  # These checks exist in LLVM's configuration, so I want to match the LLVM names
  # so that the check isn't duplicated, but we translate them into the LLDB names
  