os: deprecate os.File.write_bytes and add os.File.write_ptr (#9370)

vlib/os/os.v

@@ -340,7 +340,7 @@ pub fn write_file(path string, text string) ? {
 // write_file_array writes the data in `buffer` to a file in `path`.
 pub fn write_file_array(path string, buffer array) ? {
 	mut f := create(path) ?
-	unsafe { f.write_bytes_at(buffer.data, (buffer.len * buffer.element_size), 0) }
+	unsafe { f.write_ptr_at(buffer.data, (buffer.len * buffer.element_size), 0) }
 	f.close()
 }