[NTG-context] Problem including svg files with Inkscape 1.0~rc1-4

[Romain Diss]

Hi,

The last release candidat of Inkscape (1.0~rc1-4 on my Debian sid)
doesn't provide the `--export-pdf=` option anymore. So context can not
convert svg files into the corresponding `m_k_i_v_*` pdf.

It seems that the `--export-filename=` option does the job.

Thank in advance.

-- 
Romain Diss