Add multitarget test
Add multitarget test

Using the multitarget feature to print the configuration of multiple
compiler target configurations, a test is created.

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