Rename fletch -> dartino

src/vm/natives_cmsis.cc

 // Copyright (c) 2015, the Dartino project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
-#if defined(FLETCH_TARGET_OS_CMSIS)
+#if defined(DARTINO_TARGET_OS_CMSIS)
 
 #include "src/vm/natives.h"
 
 #include "src/shared/assert.h"
 
-namespace fletch {
+namespace dartino {
 
 BEGIN_NATIVE(UriBase) {
   UNIMPLEMENTED();
   return NULL;
 }
 END_NATIVE()
 
-}  // namespace fletch
+}  // namespace dartino
 
-#endif  // defined FLETCH_TARGET_OS_CMSIS
+#endif  // defined DARTINO_TARGET_OS_CMSIS