headers: Avoid using namespace as an argument name

Fixes Wine import from bce7e43b0ea0.

Signed-off-by: Jacek Caban <jacek@codeweavers.com>
diff --git a/mingw-w64-headers/include/d3d11shader.h b/mingw-w64-headers/include/d3d11shader.h
index 29be93d..8f4370f 100644
--- a/mingw-w64-headers/include/d3d11shader.h
+++ b/mingw-w64-headers/include/d3d11shader.h
@@ -328,7 +328,7 @@
     STDMETHOD(CreateModuleInstance)(THIS_ ID3D11ModuleInstance **instance, ID3DBlob **error) PURE;
     STDMETHOD(SetInputSignature)(THIS_ const D3D11_PARAMETER_DESC *parameter_desc, UINT parameter_count, ID3D11LinkingNode **input_node) PURE;
     STDMETHOD(SetOutputSignature)(THIS_ const D3D11_PARAMETER_DESC *parameter_desc, UINT parameter_count, ID3D11LinkingNode **output_node) PURE;
-    STDMETHOD(CallFunction)(THIS_ LPCSTR namespace, ID3D11Module *module, LPCSTR function_name, ID3D11LinkingNode **call_node) PURE;
+    STDMETHOD(CallFunction)(THIS_ LPCSTR ns, ID3D11Module *module, LPCSTR function_name, ID3D11LinkingNode **call_node) PURE;
     STDMETHOD(PassValue)(THIS_ ID3D11LinkingNode *src_node, INT src_parameter_index, ID3D11LinkingNode *dst_node, INT dst_parameter_index) PURE;
     STDMETHOD(PassValueWithSwizzle)(THIS_ ID3D11LinkingNode *src_node, INT src_parameter_index, LPCSTR src_swizzle, ID3D11LinkingNode *dst_node, INT dst_parameter_index,LPCSTR dst_swizzle) PURE;
     STDMETHOD(GetLastError)(THIS_ ID3DBlob **error) PURE;