fix cpu core query via cpuid
fix UNIX64 and WIN64: use ecx as input param
add exception handler,  the AMD cpu must be single core if it do not support HTT
Merge branch 'master' of https://github.com/cisco/openh264 into core_number_detect_fix
check cpuid max level before use cpuid.4
protect code if cpuid.4 return eax as zero
Merge pull request #122 from volvet/core_number_detect_fix

Core number detect fix
Merge remote-tracking branch 'upstream/master' into travis.osx