The overflow_allcounters test failed on Power6 with AIX (pmapi) but passes on Power6 with linux (perf_events | perfctr). Therefore detect if we're running on AIX, print a warning, but still pass the test.
The overflow_allcounters test failed on Power6 with AIX (pmapi) but passes on Power6 with linux (perf_events | perfctr). Therefore detect if we're running on AIX, print a warning, but still pass the test.

pyrovski/papi,arm-hpc/papi,pyrovski/papi,pyrovski/papi,pyrovski/papi,arm-hpc/papi,arm-hpc/papi,arm-hpc/papi,arm-hpc/papi,arm-hpc/papi,pyrovski/papi,arm-hpc/papi,pyrovski/papi,pyrovski/papi,pyrovski/papi