`perfctr`: Removal of Leftover Documentation and Outdated Code

[Treece-Burgess]

PR #191 removes the perctr and perfctr_ppc components. PR #373 further removes leftover documentation from PR 191 specifically the components README.

Six more items need to be resolved after PAPI release 7.2.0:

1. Based off documentation mpx_check currently exists for a single check and that is if you are on POWER 6 CPU with the perfctr component. As the perfctr component was removed in PR 191 this function can be restructured.
2. For the POWER 6 CPU case in ftests_util.F, we strictly set the domain to user+kernel+supervisor when using PAPI multiplexing on POWER 6/perfctr. Again since perfctr has been removed, we can either update this domain or the documentation.
3. Remove the following from Makefile.in
   • PERFCTR_INC_PATH
   • PERFCTR_LIB_PATH
   • PERFCTR_PREFIX
   • PERFCTR_ROOT
4. Remove the following from config.h.in
   • #undef HAVE_LIBPERFCTR_H
   • #undef USE_PERFCTR_PTTIMER
5. Remove the function _papi_libpfm_ntv_code_to_bits_perfctr and the leftover mention of perfctr in papi_libpfm_events.h
6. Remove the leftover mention of perfctrin papi_libpfm3_events

[Treece-Burgess]

This ties in with Issue #387.