Fix OSGI support (#664)
Fix OSGI support (#664)

Motivation:

ef6dd68503eaefdad800a7b905a1ad21a7e1408f did break OSGI support as we did not correctly include the generated MANIFEST

Modifications:

Fix configuration of plugins to include the correct MANIFEST file which has all the entries for OSGI

Result:

Fixes https://github.com/netty/netty-tcnative/issues/657
netty/netty-tcnative,netty/netty-tcnative,netty/netty-tcnative,netty/netty-tcnative