Fix build break in CrossAOT_Mono crossaot builds

[jkotas]

#106521

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[jkotas]

/backport to release/9.0-rc1

[github-actions]

Started backporting to release/9.0-rc1: https://github.com/dotnet/runtime/actions/runs/10442494811

[ericstj]

Looks good. Thank you @jkotas! @carlossanlop do we need to propose this upstream?

[jkotas]

libz-ng has #define W <integer constant> and few other similar defines for single letter symbols in one of the headers. The Windows SDK happens to use single letter field and argument names in a few places. This build break was caused by these defines being applied to Windows SDK.

There are a few options for upstream fix:

• Include system headers before libz-ng ``#define W ...`. (The change in this PR.)
  or
• Use #defines with more unique names in libz-ng