Remove unnecessary use of `transmute`

core/os/os.odin

@@ -160,13 +160,11 @@ write_entire_file :: proc(name: string, data: []byte, truncate := true) -> (succ
 }
 
 write_ptr :: proc(fd: Handle, data: rawptr, len: int) -> (int, Errno) {
-	s := transmute([]byte)mem.Raw_Slice{data, len}
-	return write(fd, s)
+	return write(fd, ([^]byte)(data)[:len])
 }
 
 read_ptr :: proc(fd: Handle, data: rawptr, len: int) -> (int, Errno) {
-	s := transmute([]byte)mem.Raw_Slice{data, len}
-	return read(fd, s)
+	return read(fd, ([^]byte)(data)[:len])
 }
 
 heap_allocator_proc :: runtime.heap_allocator_proc

core/os/os2/file_util.odin

@@ -64,13 +64,11 @@ write_encoded_rune :: proc(f: ^File, r: rune) -> (n: int, err: Error) {
 
 
 write_ptr :: proc(f: ^File, data: rawptr, len: int) -> (n: int, err: Error) {
-	s := transmute([]byte)mem.Raw_Slice{data, len}
-	return write(f, s)
+	return write(f, ([^]byte)(data)[:len])
 }
 
 read_ptr :: proc(f: ^File, data: rawptr, len: int) -> (n: int, err: Error) {
-	s := transmute([]byte)mem.Raw_Slice{data, len}
-	return read(f, s)
+	return read(f, ([^]byte)(data)[:len])
 }