Update libpfm4 to commit 4796a2 #568

Job	Run time
papi_component_amd (rocm, yes)	6m 43s
papi_component_nvidia (cuda, yes)	56s
papi_component_amd (rocm, no)	6m 5s
papi_clang_analysis	2m 43s
papi_component_amd (rocm_smi, yes)	32s
papi_component_nvidia (cuda, no)	52s
papi_component (perf_event, yes)	7m 47s
papi_component (perf_event, no)	6m 59s
papi_component_nvidia (nvml, yes)	6m 15s
papi_spack	10m 33s
papi_component_amd (rocm_smi, no)	29s
papi_component (lmsensors, yes)	7m 37s
papi_component_nvidia (nvml, no)	5m 39s
papi_component (lmsensors, no)	6m 52s
papi_component (io, yes)	8m 9s
papi_component (io, no)	7m 9s
papi_component (net, yes)	7m 54s
papi_component (net, no)	6m 43s
papi_component (powercap, yes)	11m 7s
papi_component (powercap, no)	10m 31s
papi_component (appio, yes)	8m 5s
papi_component (appio, no)	6m 55s
papi_component (coretemp, yes)	7m 49s
papi_component (coretemp, no)	7m 18s
papi_component (stealtime, yes)	7m 43s
papi_component (stealtime, no)	6m 55s
	2h 46m 20s

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