configure: pass correct cflags to container-based cross compilers
probe_target_compiler returns nonempty $target_cc for installed toolchains
and $container_cross_cc for container-based toolchains. In both cases
however the flags (coming from $cross_cc_cflags_${target_arch}) must be
in $target_cflags.
Therefore, do not clear them prior to returning from probe_target_compiler.
Reported-by: Taylor Simpson <tsimpson@quicinc.com>
Fixes: 92e288fcfb
("build: try both native and cross compilers", 2022-07-08)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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