Build fails with PAPI v6

[MonterraByte]

Trying to build this crate yields the error

error[E0425]: cannot find function, tuple struct or tuple variant `PAPI_num_counters` in crate `ffi`
   --> src/event_set.rs:542:42
    |
542 |         let num_counters = unsafe { ffi::PAPI_num_counters() };
    |                                          ^^^^^^^^^^^^^^^^^ help: a function with a similar name exists: `PAPI_num_events`

It seems like the PAPI_num_counters function was removed in the latest version of the library.