Make atomic-inline.h usable from ordinary C++ code.

Change-Id: I18dcba9cb3adc22f26403e94df4b2684f51090ed

include/cutils/atomic-inline.h

@@ -17,6 +17,10 @@
 #ifndef ANDROID_CUTILS_ATOMIC_INLINE_H
 #define ANDROID_CUTILS_ATOMIC_INLINE_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /*
  * Inline declarations and macros for some special-purpose atomic
  * operations.  These are intended for rare circumstances where a
@@ -61,4 +65,8 @@
 #define ANDROID_MEMBAR_STORE android_memory_store_barrier
 #endif
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* ANDROID_CUTILS_ATOMIC_INLINE_H */