[ REQ 5616]: X software renderer fails on 1-bit displays

[daemon]

The current (post-1.5) X geomview renderer incorrectly renders faces on
1-bit-deep displays.  They appear as clouds of scattered points, separated
on each scan line by typically 8 pixels (1 byte!).  Edges seem to render
correctly.

Just wanted to record this bug as one we need to fix before the next release.

  Stuart