rust: Remove rust_ffi_rlibs, keep rust_ffi_static

rust_ffi_static and rust_ffi_rlibs both alias to rust_library_rlib now.
We need to think about whether we need these aliases at all.

There are no users of rust_ffi_rlibs at the moment as developers are
continuing to declare rust_ffi_static modules. Let's remove this alias
in the meantime at least to simplify things.

Bug: 350633786
Bug: 383552450
Test: m blueprint_tests && m rust
Change-Id: I6be895ddbffc5ac6303f2edc9ab20f7c20cd1591
diff --git a/rust/fuzz_test.go b/rust/fuzz_test.go
index 6cb8b93..3598c99 100644
--- a/rust/fuzz_test.go
+++ b/rust/fuzz_test.go
@@ -145,6 +145,6 @@
 		t.Errorf("cc_fuzz does not contain the expected bundled transitive shared libs from rust_ffi_static ('libcc_transitive_dep'): %#v", fuzz_static_libtest.FuzzSharedLibraries().String())
 	}
 	if !strings.Contains(fuzz_staticffi_libtest.FuzzSharedLibraries().String(), ":libcc_transitive_dep.so") {
-		t.Errorf("cc_fuzz does not contain the expected bundled transitive shared libs from rust_ffi_rlib ('libcc_transitive_dep'): %#v", fuzz_staticffi_libtest.FuzzSharedLibraries().String())
+		t.Errorf("cc_fuzz does not contain the expected bundled transitive shared libs from rust_ffi_static ('libcc_transitive_dep'): %#v", fuzz_staticffi_libtest.FuzzSharedLibraries().String())
 	}
 }