fix(ffi): Handle PermissionDenied error in copy_with_cp fallback on Windows

The copy_with_cp function in build.rs attempts to use `cp -R` which fails on
Windows, then falls back to `std::fs::copy()`. However, `fs::copy()` cannot
copy directories and throws PermissionDenied on Windows instead of InvalidInput.

This commit extends the error handling to catch both InvalidInput and
PermissionDenied error kinds, routing both to copy_dir_all which properly
handles directory copying across all platforms.

Fixes: Windows builds panicking with PermissionDenied (OS Error 5)

Author: Bwen

libsql-ffi/build.rs

@@ -89,7 +89,12 @@ fn copy_with_cp(from: impl AsRef<Path>, to: impl AsRef<Path>) -> io::Result<()>
     {
         Ok(status) if status.success() => Ok(()),
         _ => match fs::copy(from.as_ref(), to.as_ref()) {
-            Err(err) if err.kind() == io::ErrorKind::InvalidInput => copy_dir_all(from, to),
+            Err(err)
+                if err.kind() == io::ErrorKind::InvalidInput
+                    || err.kind() == io::ErrorKind::PermissionDenied =>
+                {
+                    copy_dir_all(from, to)
+                },
             Ok(_) => Ok(()),
             Err(err) => Err(err),
         },