Update attributes to match gclibc's ansidecl.h

webrtc/base/criticalsection.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 71 matching lines @@
 // IMPORTANT: Unlike CritScope, the lock may not be owned by this thread in
 // subsequent code. Users *must* check locked() to determine if the
 // lock was taken. If you're not calling locked(), you're doing it wrong!
 class TryCritScope {
  public:
   explicit TryCritScope(CriticalSection* cs);
   ~TryCritScope();
 #if defined(WEBRTC_WIN)
   _Check_return_ bool locked() const;
 #else
-  bool locked() const __attribute__((warn_unused_result));
+  bool locked() const __attribute__ ((__warn_unused_result__));
 #endif
  private:
   CriticalSection* const cs_;
   const bool locked_;
   CS_DEBUG_CODE(mutable bool lock_was_called_);
   RTC_DISALLOW_COPY_AND_ASSIGN(TryCritScope);
 };
 
 // A POD lock used to protect global variables. Do NOT use for other purposes.
 // No custom constructor or private data member should be added.
@@ skipping 17 matching lines @@
   explicit GlobalLockScope(GlobalLockPod* lock) EXCLUSIVE_LOCK_FUNCTION(lock);
   ~GlobalLockScope() UNLOCK_FUNCTION();
  private:
   GlobalLockPod* const lock_;
   RTC_DISALLOW_COPY_AND_ASSIGN(GlobalLockScope);
 };
 
 } // namespace rtc
 
 #endif // WEBRTC_BASE_CRITICALSECTION_H_