* GTK-specific features, such as RSVG and librosprite, can be set to one of
three options; YES, NO or AUTO. AUTO will attempt to auto-detect its
availability and enable it if it is available.
* Haru PDF export/printing is enabled via this also. It lacks a pkg-config
file and works on RISC OS too, and thus has no auto-detection. Disabling
it disables the PDF-related menu entries in nsgtk.
svn path=/trunk/netsurf/; revision=4747