Remove USE_BUFFEREVENTS from configure.ac

LDFLAGS="$save_LDFLAGS"

CPPFLAGS="$save_CPPFLAGS"

AM_CONDITIONAL(USE_BUFFEREVENTS, test "$enable_bufferevents" = "yes")

if test "$enable_bufferevents" = "yes"; then

  AC_DEFINE(USE_BUFFEREVENTS, 1, [Defined if we're going to use Libevent's buffered IO API])

  if test "$enable_static_libevent" = "yes"; then

    TOR_LIBEVENT_LIBS="$TOR_LIBDIR_libevent/libevent_openssl.a $TOR_LIBEVENT_LIBS"

  else

    TOR_LIBEVENT_LIBS="-levent_openssl $TOR_LIBEVENT_LIBS"

  fi

fi

AC_SUBST(TOR_LIBEVENT_LIBS)

dnl ------------------------------------------------------