Embedded fonts are not available to GDI for producing LCD glpyhs.

We have now switched from deciding whether to use LCD glyphs based on whether they are installed fonts
to being a CSS/API setting on the node.
Since, on Windows, we ask GDI to produce the LCD glyphs, the font needs to be available to GDI.
For embedded fonts, they are not available. They'd need to be registered with GDI. But alternatively
we can use T2K for producing the LCD glyphs for embeded/app (non-platform) fonts.