RFR: 8295146: Clean up native code with newer C/C++ language features [v2]

[Julian Waters]

> After [JDK-8292008](https://bugs.openjdk.org/browse/JDK-8292008) and [JDK-8247283](https://bugs.openjdk.org/browse/JDK-8247283), some C and C++ code across the JDK can be replaced and simplified with cleaner language features that were previously not available due to required compatibility with the now unsupported Visual C++ 2017 compiler. These cleanups were highlighted by the very briefly integrated 8296115
> 
> No changes to the behaviour of the JDK has resulted in any way from this commit

Julian Waters has updated the pull request incrementally with one additional commit since the last revision:

  ATTRIBUTE_SCANF

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11081/files
  - new: https://git.openjdk.org/jdk/pull/11081/files/6d85c432..bb3ef0dd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11081&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11081&range=00-01

  Stats: 8 lines in 2 files changed: 4 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/11081.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11081/head:pull/11081

PR: https://git.openjdk.org/jdk/pull/11081