Follow-up to #4600, from its review. A start left OpenGL out whenever
Direct3D 12 listed an adapter, and WARP, its software adapter, is
always listed. So a GPU without a Direct3D 12 driver, which drew
through OpenGL before, now drew on the CPU. An adapter that
WGPU_ADAPTER_NAME named was left out too when it was an OpenGL one.
OpenGL is now listed when Direct3D 12 lists no hardware adapter and
when WGPU_ADAPTER_NAME is set. The Direct3D 12 check takes the shader
compiler the window does (WGPU_DX12_COMPILER, else FXC).
VoiceLessQ
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