Revert "Temporarily disable win-x86 packaging."

This reverts commit 076fdf6.

Closes #15.

Author: alexrp

zig-toolsets.proj

@@ -1,7 +1,5 @@
 <Project Sdk="Microsoft.Build.Traversal">
     <ItemGroup>
-        <!-- TODO: https://github.com/vezel-dev/zig-toolsets/issues/15 -->
-        <ProjectReference Include="src/*-*/*.proj"
-                          Exclude="src/win-x86/win-x86.proj" />
+        <ProjectReference Include="src/*-*/*.proj" />
     </ItemGroup>
 </Project>