fix(test_suite): ignore the eq_op clippy lint

This clippy lint rejects statements like the following:

    assert_eq!(app.eg1, app.eg1);

Such statements are needed here because we want to test our types'
`PartielEq` implementations.

Author: yvt

src/r3_test_suite/src/lib.rs

@@ -12,6 +12,7 @@
 #![feature(array_windows)]
 #![feature(unsafe_block_in_unsafe_fn)] // `unsafe fn` doesn't imply `unsafe {}`
 #![deny(unsafe_op_in_unsafe_fn)]
+#![allow(clippy::eq_op)] // we want to test `PartialEq` implementations
 #![doc(include = "./lib.md")]
 #![doc(include = "./common.md")]
 #![no_std]