Fix rustc test suite

Author: bjorn3

scripts/test_rustc_tests.sh

@@ -21,6 +21,7 @@ done
 
 git checkout -- tests/ui/issues/auxiliary/issue-3136-a.rs # contains //~ERROR, but shouldn't be removed
 git checkout -- tests/ui/proc-macro/pretty-print-hack/
+rm tests/ui/parser/unclosed-delimiter-in-dep.rs # submodule contains //~ERROR
 
 # missing features
 # ================