Fix duplicated `rustc_flags`.

PiperOrigin-RevId: 655723899
Change-Id: I91275f6fe2d14958d31df9c4bb030bf01fba3fe5
diff --git a/cc_bindings_from_rs/BUILD b/cc_bindings_from_rs/BUILD
index 5dc287a..de1c3bb 100644
--- a/cc_bindings_from_rs/BUILD
+++ b/cc_bindings_from_rs/BUILD
@@ -170,7 +170,6 @@
 crubit_rust_test(
     name = "run_compiler_test_support_test",
     crate = ":run_compiler_test_support",
-    rustc_flags = ["-Zallow-features=negative_impls,rustc_private"],
     rustc_flags = ["--cfg=oss"],
 )