Suppress warning of google/profiler.h since gperftools-2.2

Change-Id: Ifcc142565723ec1bbcd1d66af85187b21cfc7683

brpc/details/profiler_linker.h

@@ -8,7 +8,16 @@
 #define BRPC_PROFILER_LINKER_H
 
 #if defined(BRPC_ENABLE_CPU_PROFILER) || defined(BAIDU_RPC_ENABLE_CPU_PROFILER)
-#include <google/profiler.h>
+#ifdef __cplusplus
+extern "C" {
+#endif
+// Suppress warning of `google/profiler.h' which has been deprecated since
+// gperftools-2.2
+void ProfilerStart(const char*);
+void ProfilerStop(const char*);
+#ifdef __cplusplus
+}
+#endif
 #endif
 
 #if defined(BRPC_ENABLE_HEAP_PROFILER) || defined(BAIDU_RPC_ENABLE_HEAP_PROFILER)