Bug#719094: generates broken Class-Path in MANIFEST.MF

[Emmanuel Bourg]

Manifest files support wrapped values, see:

http://docs.oracle.com/javase/1.3/docs/guide/jar/jar.html#Notes%20on%20Manifest%20and%20Signature%20Files

"No line may be longer than 72 bytes (not characters), in its
UTF8-encoded form. If a value would make the initial line longer than
this, it should be continued on extra lines (each starting with a single
SPACE)."