linux-user targets don't need them, and if we ask to build statically
linked binaries, some static libraries they need are not available.
Signed-off-by: NLaurent Vivier <laurent@vivier.eu>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Message-Id: <20180605160958.5434-1-laurent@vivier.eu>