Parses SVG and draws it through plutovg, which lets a theme ship its
artwork as text rather than as rendered bitmaps. 33 KiB on aarch64, and
it needs nothing beyond plutovg and libc.
freetype is disabled: it only serves OpenType SVG glyphs, and pulling it
in for that would outweigh the library several times over. The bundled
plutovg wrap is refused so a failed dependency check cannot stage a
second copy over the packaged one.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>