jbig2dec: fix build (#14123)

Signed-off-by: David Korczynski <david@adalogics.com>

Author: DavidKorczynski

projects/jbig2dec/Dockerfile

@@ -19,8 +19,8 @@ RUN apt-get update && apt-get install -y make libtool pkg-config vim libreadline
 RUN git clone --recursive --depth 1 git://git.ghostscript.com/jbig2dec.git jbig2dec
 RUN mkdir tests
 RUN cp $SRC/jbig2dec/annex-h.jbig2 tests/annex-h.jb2
-RUN cd tests && wget -O t89-halftone.zip http://cgit.ghostscript.com/cgi-bin/cgit.cgi/tests.git/plain/jbig2/t89-halftone.zip && unzip t89-halftone.zip
-RUN cd tests && wget -O jb2streams.zip http://cgit.ghostscript.com/cgi-bin/cgit.cgi/tests.git/plain/jbig2/jb2streams.zip && unzip jb2streams.zip
+RUN cd tests && (wget -O t89-halftone.zip http://cgit.ghostscript.com/cgi-bin/cgit.cgi/tests.git/plain/jbig2/t89-halftone.zip && unzip t89-halftone.zip) || true
+RUN cd tests && (wget -O jb2streams.zip http://cgit.ghostscript.com/cgi-bin/cgit.cgi/tests.git/plain/jbig2/jb2streams.zip && unzip jb2streams.zip) || true
 RUN cd tests && zip -q $SRC/jbig2_fuzzer_seed_corpus.zip *.jb2
 RUN rm -rf tests
 COPY *.dict $SRC/