Allow cross-compilation if pkg-config is customized #86
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Implements #41
PKG_CONFIG_SYSROOT_DIR
or a wrapper script), then allow cross-compilation by defaultPKG_CONFIG_ALLOW_CROSS=0
disables the heuristic and always forbidstargetted_env_var
helper method, so it will also recognize per-target settings and correctly re-check if the env vars change.