RFR: [XS] 8234501 : remove obsolete NET_ReadV

[Baesken, Matthias]

Hello, please  review  this small  cleanup .

While experimenting with "link time gc" (-Wl,--gc-sections -Wl,--print-gc-sections  options [1]), a feature  that can help you identify and eliminate  unused coding,
I noticed that NET_ReadV is found and marked as unused/dead code. So it should probably be removed from the codebase .

Bug/webrev:

https://bugs.openjdk.java.net/browse/JDK-8234501

http://cr.openjdk.java.net/~mbaesken/webrevs/8234501.0/



[1]    https://linux.die.net/man/1/ld


Best regards, Matthias
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