Reverting disable of manual build.  Manual build succeeds but assembly fails if it the manual pdf is not available.  We'll have to get prince installed on build servers, or find some way to optionally include it in assembly.

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@825710 13f79535-47bb-0310-9956-ffa450edef68
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