Bresenham lines are required by ANGLE in order to support emulation
of OpenGL ES style lines on top of SwiftShader Vulkan.

Bug: b/139800520
Change-Id: I8b77775af836a238d309cc19b495b61d2c3a3487
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/37428
Presubmit-Ready: Alexis Hétu <sugoi@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>