Attempt to provide darwin support for tss-esapi

[ameba23]

tss-esapi-sys will not compile on darwin:

error: failed to run custom build command for `tss-esapi-sys v0.5.0`

Caused by:
  process didn't exit successfully: `/Users/anton/Projects/flashbots/rproxy/target/release/build/tss-esapi-sys-ffdeac5f8e8e98f3/build-script-build` (exit status: 101)
  --- stderr

  thread 'main' (70160757) panicked at /Users/anton/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tss-esapi-sys-0.5.0/build.rs:35:17:
  Compilation target (architecture, OS) tuple (aarch64, darwin) is not part of the supported tuples. Please compile with the "generate-bindings" feature or add support for your platform :)
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

This tries adding the generate-bindings feature if compiled on that platform.