Missing case fold for dfn name matching

[fantasai]

Error:

$ bikeshed
LINE 523:9: No 'dfn' refs found for '3d rendering context' that are marked for export.
  (Possible specs this could be from: css-transforms-2)
[=3D rendering context=]

The linking text was [=3D rendering context=] and the spec contained the following line in 'link-defaults':

spec:css-transforms-2; type:dfn; text:3D rendering context

The spec built correctly when I lowercased the D in the link-defaults line.

spec:css-transforms-2; type:dfn; text:3d rendering context

Tested with today's git pull.

P.S. Didn't bikeshed used to give you the link-defaults text for fixing non-exported term links?