do not default to non-prefixed pkg-config when cross compiling
This can still be requested with PKG_CONFIG=/path/to/pkg-config. Just do not use it as a default, and print a warning. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
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