RFR: 8329672: Only call SetupNativeCompilation from SetupJdkNativeCompilation [v2]

[Magnus Ihse Bursie]

> This patch will fix the few remaining places where a "raw" call to SetupNativeCompilation was made, instead of going via SetupJdkNativeCompilation. This include repairing the poor old X11Wrapper, which has been broken for some time.
> 
> After this we can finally make SetupNativeCompilation an "inner macro" of SetupJdkNativeCompilation, and stop exposing two different ways of compiling native code.
> 
> I have also added standard header comments to some places where I have missed it, and corrected an incorrect indentation (all things I found while double-checking all SetupJdkNativeCompilation calls).

Magnus Ihse Bursie has updated the pull request incrementally with three additional commits since the last revision:

 - Update documentation
 - Do not add LIBCXX for tests
 - Add ability to disable DEFAULT_VERSIONINFO_RESOURCE

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/18631/files
  - new: https://git.openjdk.org/jdk/pull/18631/files/a592e19f..ecd86477

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18631&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18631&range=00-01

  Stats: 15 lines in 3 files changed: 11 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/18631.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18631/head:pull/18631

PR: https://git.openjdk.org/jdk/pull/18631