Description: DCAP quote provider using the Intel Trusted Services API as a backend.
This crate compiles into `libdcap_quoteprov.so`, which is needed as a backend
when using `libsgx_dcap_ql`.
To use this library, the dynamic linker needs to be able to find it. This means
you should install it in your system's library path or set the
`LD_LIBRARY_PATH` environment variable.
You must set your API key in the `OCP_APIM_SUBSCRIPTION_KEY` environment
variable. You can sign up for a service subscription at
SGX: Software Guard Extensions
DCAP: DataCenter Attestation Primitives
QL: Quoting Library