RFR: 8234629: remove unused functions from libnet

[Baesken, Matthias]

Hello,

The linktime section-gc   ( see also  https://mail.openjdk.java.net/pipermail/build-dev/2019-November/026326.html   )

found a couple of other potentially unused functions / variables in libnet .
This change removes  the found  functions / variables.


Bug/webrev :
https://bugs.openjdk.java.net/browse/JDK-8234629
http://cr.openjdk.java.net/~mbaesken/webrevs/8234629.0/


Thanks, Matthias
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