Update libpfm4 to commit 4796a2 #548

Job	Run time
papi_component_amd (rocm, yes)	6m 48s
papi_component_nvidia (cuda, yes)	57s
papi_component (perf_event, yes)	7m 53s
papi_component_nvidia (cuda, no)	47s
papi_clang_analysis	4m 54s
papi_component (perf_event, no)	7m 29s
papi_component_nvidia (nvml, yes)	5m 59s
papi_component_amd (rocm, no)	5m 39s
papi_component (lmsensors, yes)	7m 28s
papi_component_amd (rocm_smi, yes)	31s
papi_component (lmsensors, no)	6m 57s
papi_spack	10m 57s
papi_component (io, yes)	7m 44s
papi_component_nvidia (nvml, no)	5m 34s
papi_component (io, no)	7m 17s
papi_component (net, yes)	8m 3s
papi_component_amd (rocm_smi, no)	29s
papi_component (net, no)	7m 8s
papi_component (powercap, yes)	11m 16s
papi_component (powercap, no)	10m 14s
papi_component (appio, yes)	7m 40s
papi_component (appio, no)	6m 57s
papi_component (coretemp, yes)	7m 29s
papi_component (coretemp, no)	6m 57s
papi_component (stealtime, yes)	7m 58s
papi_component (stealtime, no)	7m 0s
	2h 48m 5s

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