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The only part of !Boot which is TCPIPLibs related is BootVars. However, BootVars is run before we get chance to load a newer Internet module, so must run time select which to support.
Fortunately the member wanted from the returned union from socketioctl is in the same place in both BSD4.3 and BSD4.4 so all that's needed is to select the appropriate command.
Also, BootVar's local makefile rewritten to use shared makefiles.