Update attributes to match gclibc's ansidecl.h

webrtc/typedefs.h

Index: webrtc/typedefs.h
diff --git a/webrtc/typedefs.h b/webrtc/typedefs.h
index f3839c72951b11aa2a5bdcf3d3886fd2a220c594..6a3f441e22b05e36083cc122fbb71a2671330638 100644
--- a/webrtc/typedefs.h
+++ b/webrtc/typedefs.h
@@ -73,7 +73,7 @@
 // libjingle are merged.
 #if !defined(WARN_UNUSED_RESULT)
 #if defined(__GNUC__) || defined(__clang__)
-#define WARN_UNUSED_RESULT __attribute__((warn_unused_result))
+#define WARN_UNUSED_RESULT __attribute__ ((__warn_unused_result__))
 #else
 #define WARN_UNUSED_RESULT
 #endif
@@ -84,7 +84,7 @@
 //   assert(result == 17);
 #ifndef ATTRIBUTE_UNUSED
 #if defined(__GNUC__) || defined(__clang__)
-#define ATTRIBUTE_UNUSED __attribute__((unused))
+#define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
 #else
 #define ATTRIBUTE_UNUSED
 #endif
@@ -104,7 +104,7 @@
 #if defined(_MSC_VER)
 #define NO_RETURN __declspec(noreturn)
 #elif defined(__GNUC__)
-#define NO_RETURN __attribute__((noreturn))
+#define NO_RETURN __attribute__ ((__noreturn__))
 #else
 #define NO_RETURN
 #endif