Compiling Rust bindings

[hgaiser]

Description

The current value of VERSION_NUMBER is 1.15.0, but this isn't released yet. The Rust bindings use this version to decide what compiled package to download. Seeing as 1.15.0 isn't yet released, this fails to download. Downloading 1.14.0 works, but there's no way to override this behavior from other crates. Adding an option to set the version number using an environment variable gives more freedom in choosing the onnxruntime version.

In addition I experienced that including the version number also added a newline character at the end, which makes the path it generates invalid. To fix this I trimmed the version number, to remove any whitespaces (including newlines).

Lastly, the generated include dir didn't exist for me, so I corrected it to point to the include dir that did exist. I'm not sure what's going wrong here?

Motivation and Context

I wasn't able to use the Rust bindings in my crate. With these fixes I can use it.

Pinging @boydjohnson since I believe he was the main person working on moving the binding into this repository.

[hgaiser]

@microsoft-github-policy-service agree company="RoboHouse"

[boydjohnson]

@hgaiser Thanks for this contribution. So the built packages that I have looked at for 1.14.0 and 1.14.1 have include/onnxruntime_c_api.h instead of include/core/session/onnxruntime_c_api.h which they used to have. So removing them was the right fix for the download option. It isn't the right thing for the compile option, because then the path is include/core/session/.... Can you modify prepare_libort_dir_compiled to add the paths removed from generate_bindings?

[hgaiser]

@hgaiser Thanks for this contribution. So the built packages that I have looked at for 1.14.0 and 1.14.1 have include/onnxruntime_c_api.h instead of include/core/session/onnxruntime_c_api.h which they used to have. So removing them was the right fix for the download option. It isn't the right thing for the compile option, because then the path is include/core/session/.... Can you modify prepare_libort_dir_compiled to add the paths removed from generate_bindings?

I don't think it's that simple, right? prepare_libort_dir_compiled isn't adding any paths currently, nor does it have access to the bindgen builder. Even if it did, this still wouldn't be valid.

Any idea why the compiled version has these paths, but the downloaded one does not?