Update a test error message

 #17709

Author: Felix Raimundo

src/test/compile-fail/extern-foreign-crate.rs

@@ -11,4 +11,4 @@
 // Verifies that the expected token errors for `extern crate` are
 // raised
 
-extern crate foo {} //~ERROR expected one of `=`, `;`, found `{`
+extern crate foo {} //~ERROR expected `;`, found `{`