configure: Distinguish ppc64 and ppc64le hosts

We cannot use the ppc64le host compiler to build ppc64(be) guest code.
Clean up confusion between cross_cc_powerpc and cross_cc_ppc; make use
of the cflags variable as well.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20190501223819.8584-2-richard.henderson@linaro.org>
[dwg: Dropped hunk relating to ppc64abi32, it doesn't test properly]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
1 file changed