[Minor] Order of includes matters

[tiolan]

Using v1.8.1 the order of includes is important.
If I (alphabetically sorted)

#include <spdlog/fmt/bin_to_hex.h>
#include <spdlog/spdlog.h>

I get size_t not defined and a lot other issues.

But if I

#include <spdlog/spdlog.h>
#include <spdlog/fmt/bin_to_hex.h>

it works fine.

Not sure if this is to be considered a bug, but people tend to say the order of includes should not matter.

[gabime]

I think it is already fixed in pr #2035

[tiolan]

I just found this PR that I seemed to miss before.