Change graphics subsystem to 4x4 matrices

4x4 matrices aren't as optimal, but are much more sensible to handle
when you want to do more advanced stuff like scaling, skewing, or
inversion.

libobs-d3d11/d3d11-subsystem.cpp

@@ -367,10 +367,7 @@ void gs_device::UpdateBlendState()
 
 void gs_device::UpdateViewProjMatrix()
 {
-	matrix3 cur_matrix;
-	gs_matrix_get(&cur_matrix);
-
-	matrix4_from_matrix3(&curViewMatrix, &cur_matrix);
+	gs_matrix_get(&curViewMatrix);
 
 	/* negate Z col of the view matrix for right-handed coordinate system */
 	curViewMatrix.x.z = -curViewMatrix.x.z;