RFR: 8317601: Windows build on WSL broken after JDK-8317340

[Andrew Leonard]

[JDK-8317340](https://bugs.openjdk.org/browse/JDK-8317340) introduced -pathmap'ing of VS_INCLUDE paths to enable reproducible Windows builds that are not dependent on the Visual Studio tooling install location. This however requires pathmap'ing the Windows long paths generated by the compiler, which is no easy task within WSL.

This PR excludes the VS include pathmap'ing within WSL, which will mean for reproducible builds on WSL, the same VS install location must be used.

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Commit messages:
 - 8317601: Windows build on WSL broken after JDK-8317340

Changes: https://git.openjdk.org/jdk/pull/16069/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16069&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317601
  Stats: 7 lines in 1 file changed: 5 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16069.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16069/head:pull/16069

PR: https://git.openjdk.org/jdk/pull/16069