winpr/sysinfo: fixed build and detection when build with AVX
winpr/sysinfo: fixes and detection for avx PCLMULQDQ added

- fixed defines for avx aes detection
- added detection for avx carry less multiplication (PF_EX_AVX_PCLMULQDQ)
winpr/sysinfo: cleaned up cpu flag tests
Merge pull request #1097 from bmiklautz/avx_buildfix

sysinfo cpu detection and build fixes