artiq-fast: temporarily skip Windoze tests for ARTIQ-7

llvmlite needs to be rebuilt, and doing that on top of the anaconda/conda-forge LLVM packages is an even
bigger PITA than usual (Visual Studio update required + new incomprehensible conda dep handler bugs).

https://github.com/numba/llvmlite/pull/775
https://github.com/numba/llvmlite/pull/702

Users of filthy Microsoft crapware can either install an operating system or wait for upstream and anaconda/conda-forge to update.

artiq-fast.nix

@@ -33,10 +33,21 @@ let
     '';
   artiqpkgs = import "${generatedNix}/default.nix" { inherit pkgs; };
   artiqVersion = import "${generatedNix}/pkgs/artiq-version.nix" (with pkgs; { inherit stdenv fetchgit git; });
-  windowsRunner = overrides:
+  windowsRunner =
+    if (pkgs.lib.versionAtLeast artiqVersion "7.0")
+    then
+    (overrides:
+    pkgs.writeScriptBin "wfvm-run-windows-tests"
+    ''
+    ${pkgs.bash}/bin/bash
+    echo "Windows tests skipped"
+    ''
+    )
+    else
+    (overrides:
     import "${generatedNix}/windows/run-test.nix" ({
       inherit pkgs artiqpkgs;
-    } // overrides);
+    } // overrides));
   jobs = (builtins.mapAttrs (key: value: pkgs.lib.hydraJob value) artiqpkgs);
 in
   jobs // {