[C++] Regenerate ninja files when symlink was changed
diff --git a/fileutil.h b/fileutil.h
index ff7b9e0..5a4740d 100644
--- a/fileutil.h
+++ b/fileutil.h
@@ -25,6 +25,7 @@
 using namespace std;
 
 bool Exists(StringPiece f);
+double GetTimestampFromStat(const struct stat& st);
 double GetTimestamp(StringPiece f);
 
 enum struct RedirectStderr {