std/os: minor refactoring

std/os/file.jule

@@ -13,31 +13,21 @@ enum Seek: int {
 	End: 2, // Seek relative to the end
 }
 
-// Enum wrapper for type-safe o-flags.
-enum oFlag: int {
-	Rdonly: sys::O_RDONLY,
-	Wronly: sys::O_WRONLY,
-	Rdwr: sys::O_RDWR,
-	Append: sys::O_APPEND,
-	Create: sys::O_CREAT,
-	Excl: sys::O_EXCL,
-	Sync: sys::O_SYNC,
-	Trunc: sys::O_TRUNC,
-}
-
 // Flags to open wrapping those of the underlying system.
 // Not all flags may be implemented on a given system.
 // Exactly one of O_RDONLY, O_WRONLY, or O_RDWR must be specified.
 //
 // All flags have the underlying enum type for type safety.
-const O_RDONLY = oFlag.Rdonly // Open the file read-only
-const O_WRONLY = oFlag.Wronly // Open the file write-only
-const O_RDWR = oFlag.Rdwr     // Open the file read-write
-const O_APPEND = oFlag.Append // Append data to the file when writing
-const O_CREATE = oFlag.Create // Create a new file if none exists
-const O_EXCL = oFlag.Excl     // Used with O_CREATE, file must not exist
-const O_SYNC = oFlag.Sync     // Open for synchronous I/O
-const O_TRUNC = oFlag.Trunc   // Truncate regular writable file when opened
+type oFlag: int
+
+const O_RDONLY = sys::O_RDONLY // Open the file read-only
+const O_WRONLY = sys::O_WRONLY // Open the file write-only
+const O_RDWR = sys::O_RDWR     // Open the file read-write
+const O_APPEND = sys::O_APPEND // Append data to the file when writing
+const O_CREATE = sys::O_CREAT  // Create a new file if none exists
+const O_EXCL = sys::O_EXCL     // Used with O_CREATE, file must not exist
+const O_SYNC = sys::O_SYNC     // Open for synchronous I/O
+const O_TRUNC = sys::O_TRUNC   // Truncate regular writable file when opened
 
 // The file stream handle.
 //