Make the utf16 conversion procedures in core:sys/windows safer by checking for memory leaks

core/os/os2/file_stream.odin

@@ -2,12 +2,20 @@ package os2
 
 import "core:io"
 
-file_to_stream :: proc(f: ^File) -> (s: io.Stream) {
+to_stream :: proc(f: ^File) -> (s: io.Stream) {
 	s.stream_data = f
 	s.stream_vtable = _file_stream_vtable
 	return
 }
 
+to_writer :: proc(f: ^File) -> (s: io.Writer) {
+	return {to_stream(f)}
+}
+to_reader :: proc(f: ^File) -> (s: io.Reader) {
+	return {to_stream(f)}
+}
+
+
 @(private)
 error_to_io_error :: proc(ferr: Error) -> io.Error {
 	if ferr == nil {