Test RtAudio api and port counts

rtatest.cpp

// g++ -lrtaudio -o rtatest rtatest.cpp
#include <rtaudio/RtAudio.h>
#include <iostream>
#include <string>
#include <vector>

int main(int a, char **b)
{
    std::vector<RtAudio::Api> apis;
    RtAudio::getCompiledApi(apis);
    for (auto m = apis.begin(); m != apis.end(); m++) {
        std::cout << "trying " << (int)*m << ": " << RtAudio::getApiDisplayName(*m) << std::endl;
        try {
            RtAudio *rta = new RtAudio(*m);
            if (rta) {
                std::cout << "num ports: " << rta->getDeviceCount() << std::endl;
                delete rta;
            }
        }
        catch(...) {
            std::cout << "caught exception" << std::endl;
        }
    }
    return 0;
}