[11u] RFR: backport of 8219583: Windows build failure after JDK-8214777 (Avoid some GCC 8.X strncpy() errors in HotSpot)

[Simon Tooke]

Hello,

I would like to propose a backport of jdk-8214777, which was added to
JDK13 to fix a compile error on some versions of Visual Studio.  This
backport will both improve compatibility with older compilers, and
increase ease of backporting future changes to this file.

This backport requires 821477 to be committed prior, and will not merge
otherwise.

The original patch is unchanged for jdk11u.

bug: https://bugs.openjdk.java.net/browse/JDK-8219583

original patch: http://hg.openjdk.java.net/jdk/jdk/rev/45a23c64d0f6

Please let me know your thoughts.

Thank you for your time,

-Simon