configure: Use quotes around uses of $CPU_CFLAGS
About half of the values to which CPU_CFLAGS is set have multiple space separated arguments. Signed-off-by: NRichard Henderson <richard.henderson@linaro.org> Message-Id: <20190501223819.8584-3-richard.henderson@linaro.org> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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