Fix build Linux GLIBC-2.8 and earlier. (#841)
Fix build Linux GLIBC-2.8 and earlier. (#841)

* Fix build Linux GLIBC-2.8 and earlier. Tested on CentOS5 and GLIBC-2.5. Tested on both 32 and 64 bit
Cinegy/srt,Haivision/srt,Cinegy/srt,Cinegy/srt,Cinegy/srt,ethouris/srt,Haivision/srt,Haivision/srt,ethouris/srt,Haivision/srt,ethouris/srt,ethouris/srt