Introduce additional constructor for unions holding a fixed size array of data.

samples/OcclusionQuery/OcclusionQuery.cpp

@@ -129,7 +129,7 @@ int main( int /*argc*/, char ** /*argv*/ )
     commandBuffer.resetQueryPool( queryPool, 0, 2 );
 
     std::array<vk::ClearValue, 2> clearValues;
-    clearValues[0].color        = vk::ClearColorValue( std::array<float, 4>( { { 0.2f, 0.2f, 0.2f, 0.2f } } ) );
+    clearValues[0].color        = vk::ClearColorValue( 0.2f, 0.2f, 0.2f, 0.2f );
     clearValues[1].depthStencil = vk::ClearDepthStencilValue( 1.0f, 0 );
     commandBuffer.beginRenderPass(
       vk::RenderPassBeginInfo( renderPass, framebuffers[currentBuffer.value], vk::Rect2D( vk::Offset2D(), surfaceData.extent ), clearValues ),