cmake HAVE_LINUX_IF_ADDR_H examples

rbfx/rbfx Source/ThirdParty/libdatachannel/deps/usrsctp/CMakeLists.txt :100 

add_definitions(-DHAVE_LINUX_IF_ADDR_H)

yanhua133/mediasoup-sfu-cpp deps/usrsctp/CMakeLists.txt :104 

add_definitions(-DHAVE_LINUX_IF_ADDR_H)