Update talk to 56092586.

R=jiayl@webrtc.org, mallinath@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/3359004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5078 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/talk/base/common.h b/talk/base/common.h
index 6350baf..d557639 100644
--- a/talk/base/common.h
+++ b/talk/base/common.h
@@ -198,7 +198,7 @@
 // TODO(ajm): Hack to avoid multiple definitions until the base/ of webrtc and
 // libjingle are merged.
 #if !defined(WARN_UNUSED_RESULT)
-#if defined(COMPILER_GCC)
+#if defined(__GNUC__)
 #define WARN_UNUSED_RESULT __attribute__((warn_unused_result))
 #else
 #define WARN_UNUSED_RESULT