dev: error: no graphics toolkit available for plotting

[Dmitri A. Sergatskov]

Something broke dev snapshots:

http://buildbot.octave.org:8010/#/builders/24/builds/353/steps/5/logs/stdio

http://buildbot.octave.org:8010/#/builders/11/builds/353/steps/5/logs/stdio

etc...

<<<

/bin/sh run-octave --norc --silent --no-history --path /home/buildbotu/fc25-x86_64/gcc-fedora/build/../src/doc/interpreter/ --eval "interpimages ('doc/interpreter/', 'interpn', 'txt');"
error: no graphics toolkit available for plotting
make[2]: *** [Makefile:27309: doc/interpreter/triplot.txt] Error 1

>>>

Dmitri.
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