std: fs: skip fs tests on xous

The xous filesystem support is not yet ready for merging.

Signed-off-by: Sean Cross <sean@xobs.io>

Author: xobs

library/std/src/fs.rs

@@ -8,7 +8,7 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 #![deny(unsafe_op_in_unsafe_fn)]
 
-#[cfg(all(test, not(any(target_os = "emscripten", target_env = "sgx"))))]
+#[cfg(all(test, not(any(target_os = "emscripten", target_env = "sgx", target_os = "xous"))))]
 mod tests;
 
 use crate::ffi::OsString;