add dxc to all_vendor.odin

examples/all/all_vendor.odin

@@ -73,10 +73,12 @@ _ :: MTK
 _ :: CA
 
 
+import DXC   "vendor:directx/dxc"
 import D3D11 "vendor:directx/d3d11"
 import D3D12 "vendor:directx/d3d12"
 import DXGI  "vendor:directx/dxgi"
 
+_ :: DXC
 _ :: D3D11
 _ :: D3D12
 _ :: DXGI