Author: Matteo Bini <matteobin@tiepi.it>
Description: Fix ftbfs with GCC-13
Forwarded: https://github.com/alexkay/spek/commit/b1600d9926fa434330171cbebb407d2d0ccdcf03
--- a/tests/perf.cc
+++ b/tests/perf.cc
@@ -1,3 +1,4 @@
+#include <cstdint>
 #include <cstdlib>
 #include <iostream>
 #include <fstream>