RFR: 8329289: Unify SetupJdkExecutable and SetupJdkLibrary [v2]

[Magnus Ihse Bursie]

> Currently a lot of code is duplicated between SetupJdkExecutable and SetupJdkLibrary. Furthermore, some functionality is still missing from SetupJdkExecutable that is present in SetupJdkLibrary. These functions also have not had their documentation properly updated as they have evolved. This PR will fix all of this.

Magnus Ihse Bursie has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:

 - Merge branch 'master' into unify-jdk-compilation
 - FIx documentation
 - Remove FindSrcDirsForLib
 - Unify and simplify code
 - Merge SetupJdkExecutable and SetupJdkLibrary into SetupJdkNativeCompilation

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Changes: https://git.openjdk.org/jdk/pull/18537/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18537&range=01
  Stats: 170 lines in 1 file changed: 52 ins; 83 del; 35 mod
  Patch: https://git.openjdk.org/jdk/pull/18537.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18537/head:pull/18537

PR: https://git.openjdk.org/jdk/pull/18537