tests/api.c: Try to simulate how the gdk-pixbuf loader calls librsvg
tests/api.c: Try to simulate how the gdk-pixbuf loader calls librsvg

For https://gitlab.gnome.org/GNOME/librsvg/issues/433

GNOME/librsvg,GNOME/librsvg,GNOME/librsvg,GNOME/librsvg