papi.h: re-add PAPI_descr_error() support
papi.h: re-add PAPI_descr_error() support

PAPI_descr_error() was removed because after the PAPI_strerror()
changes it was redundant.  The declaration was never removed from
papi.h.

This change makes PAPI_descr_error() just be a backward compatability
define

\#define PAPI_descr_error(a) PAPI_strerror(a)

This should preserve backward compatability.

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