linux-user: move xtensa signal.c parts to xtensa directory
No code change, only move code from signal.c to xtensa/signal.c, except adding includes and exporting setup_rt_frame(). Signed-off-by: NLaurent Vivier <laurent@vivier.eu> Reviewed-by: NAlex Bennée <alex.bennee@linaro.org> Reviewed-by: NRichard Henderson <richard.henderson@linaro.org> Message-Id: <20180424192635.6027-16-laurent@vivier.eu>
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