[jdk11u-dev] RFR: 8250863: Build error with GCC 10 in NetworkInterface.c and k_standard.c

[Aleksey Shipilev]

Clean backport towards cleaner GCC 10 builds. My CI has to build 11u with `-Wno-stringop-truncation` because of this. With this patch, GCC 10 builds without disabling that warning (there are few others to resolve...)

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Commit messages:
 - Backport e3c6574ac042642a5b30b96b945d86e709ba2a6b

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/335/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=335&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8250863
  Stats: 9 lines in 2 files changed: 6 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/335.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/335/head:pull/335

PR: https://git.openjdk.java.net/jdk11u-dev/pull/335