Use portable format conversion specifier for uint64_t

Avoids a warning when compiling for iOS: format specifies type
'unsigned long' but the argument has type 'uint64_t' (aka 'unsigned
long long').

Change-Id: I8b5205dd0c3a8ae2f531f1647b3e3bac27ea6065
Reviewed-on: https://gerrit.libreoffice.org/78985
Reviewed-by: Tor Lillqvist <tml@collabora.com>
Tested-by: Tor Lillqvist <tml@collabora.com>

common/Util.hpp

@@ -12,6 +12,7 @@
 
 #include <cassert>
 #include <cerrno>
+#include <cinttypes>
 #include <cstddef>
 #include <cstring>
 #include <atomic>
@@ -761,7 +762,7 @@ int main(int argc, char**argv)
     inline void vectorAppendHex(std::vector<char> &vector, uint64_t number)
     {
         char output[32];
-        sprintf(output, "%lx", number);
+        sprintf(output, "%" PRIx64, number);
         vectorAppend(vector, output);
     }