Add missing import for cstdint to tools/bits2rbt/header.h

Signed-off-by: Dennis Schmidt <20640295+dlschmidt@users.noreply.github.com>

tools/bits2rbt/header.h

diff --git a/tools/bits2rbt/header.h b/tools/bits2rbt/header.h
index 3c42fb4..f422b74 100644
--- a/tools/bits2rbt/header.h
+++ b/tools/bits2rbt/header.h
@@ -4,6 +4,7 @@
 #include <iostream>
 #include <string>
 #include <vector>
+#include <cstdint>
 
 class Header {
        public: