Fixes to get Dart VM compiling on Ubuntu 13.04, Debian Wheezy.

runtime/bin/dartutils.cc

 // Copyright (c) 2012, the Dart 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 file.
 
 #include "bin/dartutils.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
@@ skipping 346 matching lines @@
   Dart_Handle str = Dart_NewStringFromUTF8(buffer,
                                            bufferLen);
   free(buffer);
   return str;
 }
 
 
 static const uint8_t* ReadFileFully(const char* filename,
                                     intptr_t* file_len,
                                     const char** error_msg) {
+  *file_len = -1;
   void* stream = DartUtils::OpenFile(filename, false);
   if (stream == NULL) {
     SET_ERROR_MSG(error_msg, "Unable to open file: %s", filename);
     return NULL;
   }
-  *file_len = -1;
   const uint8_t* text_buffer = NULL;
   DartUtils::ReadFile(&text_buffer, file_len, stream);
   if (text_buffer == NULL || *file_len == -1) {
     *error_msg = "Unable to read file contents";
     text_buffer = NULL;
   }
   DartUtils::CloseFile(stream);
   return text_buffer;
 }
 
@@ skipping 620 matching lines @@
       new CObjectString(CObject::NewString(os_error->message()));
   CObjectArray* result = new CObjectArray(CObject::NewArray(3));
   result->SetAt(0, new CObjectInt32(CObject::NewInt32(kOSError)));
   result->SetAt(1, new CObjectInt32(CObject::NewInt32(os_error->code())));
   result->SetAt(2, error_message);
   return result;
 }
 
 }  // namespace bin
 }  // namespace dart