Add run-make/rustdoc-test-args into the list of ignored tests

Author: GuillaumeGomez

tests/failing-run-make-tests.txt

@@ -40,4 +40,4 @@ tests/run-make/issue-36710/
 tests/run-make/issue-68794-textrel-on-minimal-lib/
 tests/run-make/lto-smoke-c/
 tests/run-make/return-non-c-like-enum/
-
+tests/run-make/rustdoc-test-args/