[core] Deleted CPerfMon struct typedef from srt.h
[core] Deleted CPerfMon struct typedef from srt.h

Cinegy/srt,Cinegy/srt,ethouris/srt,Cinegy/srt,ethouris/srt,Haivision/srt,Haivision/srt,Cinegy/srt,ethouris/srt,Haivision/srt,ethouris/srt,Haivision/srt