Compile warnings on platforms where size_t is not 64-bits

[Matthew-McRaven]

In elfio_segment.hpp, line 172, a ULLONG is passed to set_stream_size. On platforms where sizeof(size_t) != sizeof(uint64_t), this will cause a compile time warning about constant conversion. This also affects elfio_section.hpp

I am raising this issue because (strangely enough), I have a 32-bit use case. My project consumes this library, and outputs a WASM binary. WASM, as of right now, always uses 32-bit pointers, which to my understanding means size_t is 32-bits, not 64-bits. This causes my compilation logs to be flooded with constant conversion warning.

I see two easy ways to fix this:

1. Change the signature of set_stream_size to always take a uint64_t.
2. Pass a value of std::numeric_limits<size_t>::max() to set_stream_size (see reference).

My preference would be option 2, as this would avoid API type changes.

If either of these approaches are acceptable, I will open a pull request.

[serge1]

Hi,

Thank you for your interest in the library. Yes, please submit the PR. In case additional questions will raise, we'll be able to discuss them there.

Best regards, Serge