Regression: The script to build the crypto ffi bindings is not working anymore

[BillCarsonFr]

I think related to that #2997 that did remove the UDL file

Now the script is failing https://github.com/matrix-org/matrix-rust-sdk/blob/main/bindings/apple/build_crypto_xcframework.sh

Caused by:
    0: failed to open file `../../bindings/matrix-sdk-crypto-ffi/src/olm.udl`
    1: No such file or directory (os error 2)
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[BillCarsonFr]

This is blocking update of the legacy apps that would benefit from recent fixes on the crypto sdk