Revert "test: xfail-fast run-pass/cci_iter.exe"

This reverts commit c0a5e21.

Author: brson

src/test/run-pass/cci_iter_exe.rs

@@ -1,4 +1,3 @@
-// xfail-fast - check-fast doesn't understand aux-build
 // aux-build:cci_iter_lib.rs
 
 use std;