Try to get atomic.h included correctly for C++

.gitignore

@@ -34,4 +34,5 @@ depend.mk
 
 # Vi swap files
 .*.swp
-/build/
+/build/
+*.reviewboardrc

log_manager/log_manager.cc

@@ -26,6 +26,7 @@
 #include <stdarg.h>
 #include <errno.h>
 #include <syslog.h>
+#include <atomic.h>
 
 #include <skygw_debug.h>
 #include <skygw_types.h>

server/include/atomic.h

@@ -30,5 +30,9 @@
  * @endverbatim
  */
 
+#ifdef __cplusplus
+extern "C" int atomic_add(int *variable, int value);
+#else
 extern int atomic_add(int *variable, int value);
 #endif
+#endif