rust: add path: is_absolute

This adds thew new API call that was added last night.

Signed-off-by: Sean Cross <[email protected]>

0002-std-xous-add-support-for-path.patch

@@ -1,15 +1,15 @@
-From ec265421f0119b78cc11eb5c16ce7babfe37776b Mon Sep 17 00:00:00 2001
+From e32a8e960c786a1070255f99e765ba53e994d559 Mon Sep 17 00:00:00 2001
 From: Sean Cross <[email protected]>
 Date: Tue, 6 Aug 2024 22:45:31 +0800
-Subject: [PATCH 2/5] std: xous: add support for path
+Subject: [PATCH 2/4] std: xous: add support for path
 
 Add support for the Xous-specific path implementation.
 
 Signed-off-by: Sean Cross <[email protected]>
 ---
  library/std/src/sys/path/mod.rs  |  3 ++
- library/std/src/sys/path/xous.rs | 72 ++++++++++++++++++++++++++++++++
- 2 files changed, 75 insertions(+)
+ library/std/src/sys/path/xous.rs | 76 ++++++++++++++++++++++++++++++++
+ 2 files changed, 79 insertions(+)
  create mode 100644 library/std/src/sys/path/xous.rs
 
 diff --git a/library/std/src/sys/path/mod.rs b/library/std/src/sys/path/mod.rs
@@ -28,10 +28,10 @@ index 24a94ec7828..c501416f718 100644
          pub use unix::*;
 diff --git a/library/std/src/sys/path/xous.rs b/library/std/src/sys/path/xous.rs
 new file mode 100644
-index 00000000000..262bfe5985c
+index 00000000000..c1f6359b117
 --- /dev/null
 +++ b/library/std/src/sys/path/xous.rs
-@@ -0,0 +1,72 @@
+@@ -0,0 +1,76 @@
 +use crate::ffi::OsStr;
 +use crate::io;
 +use crate::path::{Path, PathBuf, Prefix};
@@ -59,6 +59,10 @@ index 00000000000..262bfe5985c
 +    Ok(path.to_owned())
 +}
 +
++pub(crate) fn is_absolute(path: &Path) -> bool {
++    path.has_root() && path.prefix().is_some()
++}
++
 +/// Split a path into its constituant Basis and Dict, if the path is legal.
 +pub(crate) fn split_basis_and_dict<'a, F: Fn() -> Option<&'a str>>(
 +    src: &'a str,