cmake HAVE_SYS_AHAFS_EVPRODS_H examples

yanhua133/mediasoup-sfu-cpp deps/libuv/CMakeLists.txt :145 

list(APPEND uv_defines
       _ALL_SOURCE
       _LINUX_SOURCE_COMPAT
       _THREAD_SAFE
       _XOPEN_SOURCE=500
       HAVE_SYS_AHAFS_EVPRODS_H)