Upgrade openoffice-devel to a more recent snapshot and unbreak. Recent
versions of clang do not like building system boost in -std=gnu++98 mode.
Add USE_GNOME=gdkpixbuf2xlib which now seems to be necessary.
Simplify the port by always using the bundled vigra and boost rather
than making this compiler version dependent. The bundled versions
work (better) with modern clang in -std=gnu++98 mode. Also, an
upcoming version of boost will require c++14 mode. The bundled
boost needs a minor patch to work with modern clang in this mode.
Add upgrade advice to pkg-message.
Security: 6678211c-bd47-11ed-beb0-1c1b0d9ea7e6
