[from-scratch] Use giflib 1.5.4 to avoid bob.io.image#13

from-scratch.sh

@@ -106,7 +106,7 @@ ${CONDA} install --yes -n ${NAME} --override-channels -c defaults \
 ${CONDA} install --yes -n ${NAME} --override-channels -c defaults -c conda-forge \
   boost=1.61.0 \
   ffmpeg=2.8.6 \
-  giflib=5.1.2 \
+  giflib=5.1.4 \
   ipdb \
   libblitz=0.10 \
   libmatio=1.5.6 \