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Use fold instead of passing a wrap length to base64.

The base64 implementation included with MacOS 10.7 doesn't
support the -w option for wrapping lines. Using the fold
command is more portable.

--- a/doc/build_draft.sh

+++ b/doc/build_draft.sh

@@ -35,7 +35,7 @@

 tar czf opus_source.tar.gz "${destdir}"

 echo building base64 version

-cat opus_source.tar.gz| base64 -w 66 | sed 's/^/###/' > opus_source.base64

+cat opus_source.tar.gz| base64 | fold -w 66 | sed 's/^/###/' > opus_source.base64

 #echo '<figure>' > opus_compare_escaped.c

 #echo '<artwork>' >> opus_compare_escaped.c