configure: redirect sphinx-build check to config.log
Otherwise it's hard to debug whats going on. Signed-off-by: NAlex Bennée <alex.bennee@linaro.org> Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: NRichard Henderson <richard.henderson@linaro.org> Message-Id: <20200414200631.12799-8-alex.bennee@linaro.org>
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