`dev.capabilities("glyphs")` is `NA` instead of `TRUE`

[trevorld]

• It looks like in #159 you updated the dev.capabilities() output to report most of the new capabilities.
• However it appears you may have overlooked updating the "glyphs" entry which currently reports NA:

ragg::agg_png()
dev.capabilities("glyphs")
invisible(dev.off())

$glyphs
[1] NA

In contrast the Cairo device reports TRUE:

png(type="cairo")
dev.capabilities("glyphs")
invisible(dev.off())

$glyphs
[1] TRUE

[thomasp85]

Thank you for the quick discovery