Update FileManagerTests.swift

Author: AZero13

Tests/FoundationEssentialsTests/FileManager/FileManagerTests.swift

@@ -1072,9 +1072,10 @@ private struct FileManagerTests {
                 guard let posix = error.underlying as? POSIXError else { throw error }
                 #if canImport(Darwin)
                 // .ENOTSUP is Darwin-specific.
-                guard posix.code == .ENOTSUP || posix.code == .EOPNOTSUPP else { throw error }
+                guard posix.code == .ENOTSUP || posix.code == .EOPNOTSUPP || posix.code == .EPERM else { throw error }
                 #else
-                guard posix.code == .EOPNOTSUPP else { throw error }
+                // .EPERM can occur on Linux if xattrs on symlinks aren't permitted.
+                guard posix.code == .EOPNOTSUPP || posix.code == .EPERM else { throw error }
                 #endif
                 return
             }