[master] Added missing inclusion of <cstdint> in strutil.h.

Okayed on jabber.

src/lib/util/strutil.h

@@ -9,6 +9,7 @@
 
 #include <algorithm>
 #include <cctype>
+#include <cstdint>
 #include <string>
 #include <sstream>
 #include <vector>