Revert "Fix warnings"

[sauwming]

Reverts #3778

To fix #3785

[nanangizz]

Right, I think those originally are compile warnings treated as errors (e.g: due to -Werror=format). pj_size_t/pj_ssize_t can be long or not, so print format can be tricky. So I guess if we decide to use %ld/%lu, we need to ignore the format warnings when pj_size_t/pj_ssize_t is not using long?

[sauwming]

Yes, it is tricky.
Initially I want to revert this commit and resort to using cast instead, i.e. "%u", (unsigned) ...., but then I realise that we have been using %lu everywhere else, so the problem is not with this commit.

It turns out that we need to use %zu instead for size_t:
https://cplusplus.com/reference/cstdio/printf/
https://www.tutorialspoint.com/what-is-the-correct-way-to-use-printf-to-print-a-size-t-in-c-cplusplus

[nanangizz]

The %zu may have a drawback as it seems to be introduced in C99, while AFAIK the library has been trying to conform to C89.

See https://copyprogramming.com/howto/is-the-zu-specifier-required-for-printf

[sauwming]

Ah okay, I guess we shouldn't use zu, it seems that it may cause issues with VS and mingw as well.

So I suppose the safest approach for us is to cast it to unsigned long, i.e. printf("%lu\n", (unsigned long)n)