socketio_berkeley.c: values of EAGAIN and EWOULDBLOCK are different on VxWorks
uniqueid_vxworks.c: VxWorks' uuid implementation
azure_c_shared_utilityFunctions.cmake: add VxWorks' uuid adapter selection.
azure_iot_build_rules.cmake: make VxWorks use non-POSIX APIs
socketio_berkeley.c: values of EAGAIN and EWOULDBLOCK are different on VxWorks uniqueid_vxworks.c: VxWorks' uuid implementation azure_c_shared_utilityFunctions.cmake: add VxWorks' uuid adapter selection. azure_iot_build_rules.cmake: make VxWorks use non-POSIX APIs