[PATCH vkd3d v2 2/8] tests: Test struct initializers.

[Zebediah Figura (she/her)]

This one fails when run under Windows:

shader_runner_d3d12:140:Section [pixel shader], line 1: Test failed: 
Failed to compile shader, hr 0x80004005.
shader_runner_d3d12:144:Section [pixel shader], line 1: 
Z:\home\meg\git\build-vkd3d\Shader at 0x00000000006D0700(10,16): error 
X3651: ps_4_0 does not support doubles