Remove duplicate package export

Change-Id: I185610f12069cd4ce1b27650581375b6b3019d2f
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/META-INF/MANIFEST.MF

@@ -26,9 +26,6 @@ Export-Package: org.eclipse.jgit.api;version="3.2.0",
  org.eclipse.jgit.internal.storage.pack;version="3.2.0";
   x-friends:="org.eclipse.jgit.test,
    org.eclipse.jgit.pgm",
- org.eclipse.jgit.internal.storage.pack;version="3.2.0";
-  x-friends:="org.eclipse.jgit.test,
-   org.eclipse.jgit.pgm",
  org.eclipse.jgit.lib;version="3.2.0",
  org.eclipse.jgit.merge;version="3.2.0",
  org.eclipse.jgit.nls;version="3.2.0",