Update project authors statements to Dartino

src/shared/platform_posix.cc

-// Copyright (c) 2014, the Fletch project authors. Please see the AUTHORS file
+// Copyright (c) 2014, 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_POSIX)
 
 // We do not include platform_posix.h on purpose. That file
 // should never be directly inported. platform.h is always
 // the platform header to include.
 #include "src/shared/platform.h"  // NOLINT
 
@@ skipping 225 matching lines @@
 
 bool VirtualMemory::Uncommit(uword address, int size) {
   return mmap(reinterpret_cast<void*>(address), size, PROT_NONE,
               MAP_PRIVATE | MAP_ANON | MAP_NORESERVE, kMmapFd,
               kMmapFdOffset) != MAP_FAILED;
 }
 
 }  // namespace fletch
 
 #endif  // defined(FLETCH_TARGET_OS_POSIX)