Add test/data/artificial to seed_corpora.txt
# This file is not used by Wuffs per se, but it is used by the "projects/wuffs"
# directory in the https://github.com/google/oss-fuzz repository.
-gif: test/data/*.gif
-gzip: test/data/*.gz
+gif: test/data/*.gif test/data/artificial/*.gif
+gzip: test/data/*.gz test/data/artificial/*.gz
zlib: test/data/*.zlib
