Restore GPU compilation on Windows

[Lestropie]

Related to #3384.

• Generate a second Dawn pre-compiled library download using GCC16 with native TLS.
• Implement requisite logic in cmake to determine which of the two downloads is suitable
  Ideally based on a linking test rather than just compiler version numbers, but will have to see how complex it might be.
• Re-enable GPU compilation in Windows CI check.