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glamor: explicitly draw endpoints of line segments

Jan Engelhardt requested to merge jengelh/xserver:master into master

The OpenGL 4.6 specification §14.5.1 "Basic Line Rasterization" figure 14.2 says:

"""A diamond shaped region of height 1 is placed around each fragment center; those regions that the line segment exits cause rasterization to produce corresponding fragments."""

As the line does not necessarily exit the last diamond, it is necessary to explicitly paint a pixel at line ends.

Fixes: #1434

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