feat: conditional compilation support #97
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The example build script converts `DEP_NGINX_FEATURES`, `DEP_NGINX_OS` and `DEP_NGINX_VERSION_NUMBER` received from `nginx-sys` to the `cfg` values for conditional compilation. See tests for usage examples.
The flags set in cargo config will be ignored if the `RUSTFLAGS` is set.
Document cargo metadata variables set by the build script.
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Nginx has various configuration options that may affect the availability of functions, constants and structure fields. This is not something that can be detected at runtime, as an attempt to use a symbol unavailable in the bindings would result in compilation error.
This PR introduces translation of a limited subset of
NGX_...macros to the Rustcfgflags, allowing conditional checks like#[cfg(ngx_feature = "debug")].There's no publicly available code that uses these flags yet, but I already need the functionality for some WIP stuff.