windows: avoid fontconfig and ensure build compiles (#11698)

This changes allows me to use ghostty as a zon dependency when building
on windows (for windows). Fixes
https://github.com/ghostty-org/ghostty/discussions/11697

.github/workflows/test.yml

@@ -744,6 +744,10 @@ jobs:
           Write-Host "Zig installed."
           .\zig\zig.exe version
 
+      - name: Compile build
+        shell: pwsh
+        run: .\zig\zig.exe build --help
+
       - name: Generate build testing script
         shell: pwsh
         run: |