Allow --config path without config-include
Allow --config path without config-include

As per
https://github.com/rust-lang/cargo/issues/7722#issuecomment-1098612205

rust-lang/cargo,rustyhorde/cargo,nipunn1313/cargo,eminence/cargo,rust-lang/cargo,nipunn1313/cargo,nipunn1313/cargo,rustyhorde/cargo,rustyhorde/cargo,eminence/cargo,rust-lang/cargo,nipunn1313/cargo,eminence/cargo,rust-lang/cargo,rustyhorde/cargo,eminence/cargo