gpu/internal/convertshaders: build compute shaders in HLSL cs_5_0 profile

The recent changes to the compute shaders have fixed all errors
previously reported by fxc. Switch from dxc to fxc to target shader
model 5.0, supported by Direct3D 11.

Because we know dxc must be available, always build compute shaders even
though the result is not yet used.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

gpu/internal/convertshaders/hlsl.go

@@ -46,6 +46,8 @@ func (fxc *FXC) Compile(path, variant string, input []byte, entryPoint string, p
 		profile = "ps_" + profileVersion
 	case ".vert":
 		profile = "vs_" + profileVersion
+	case ".comp":
+		profile = "cs_" + profileVersion
 	default:
 		return "", fmt.Errorf("unrecognized shader type %s", path)
 	}