[WIP] Add Piranha package

It builds fine, but fails to install with:
```
...
[piranha] [100%] Built target rectangular_perf
[piranha] Linking CXX executable pearce2_perf
[piranha] [100%] Built target pearce2_perf
[piranha] make: *** No rule to make target `install'.  Stop.
[piranha ERROR] Command '[u'/bin/bash', '_hashdist/build.sh']' returned non-zero exit status 2
[piranha ERROR] command failed (code=2); raising
```

I have reported the issue upstream: https://github.com/bluescarni/piranha/issues/3

/cc @bluescarni