drop windows test

test/threads.jl

@@ -357,13 +357,12 @@ end
 
 @testset "jl_*affinity" begin
     cpumasksize = @ccall uv_cpumask_size()::Cint
-    if cpumasksize > 0 # otherwise affinities are not supported on the platform (UV_ENOTSUP)
+    if !Sys.iswindows() && cpumasksize > 0 # otherwise affinities are not supported on the platform (UV_ENOTSUP)
         mask = zeros(Cchar, cpumasksize);
         jl_getaffinity = (tid, mask, cpumasksize) -> ccall(:jl_getaffinity, Int32, (Int16, Ptr{Cchar}, Int32), tid, mask, cpumasksize)
         jl_setaffinity = (tid, mask, cpumasksize) -> ccall(:jl_setaffinity, Int32, (Int16, Ptr{Cchar}, Int32), tid, mask, cpumasksize)
         @test jl_getaffinity(1, mask, cpumasksize) == 0
-        fill!(mask, 0)
-        mask[begin] = 1
+        fill!(mask, 1)
         @test jl_setaffinity(1, mask, cpumasksize) == 0
     end
 end