add back jdk version to MANIFEST.MF
diff --git a/osgi.bnd b/osgi.bnd
index cac520e..ceeed25 100644
--- a/osgi.bnd
+++ b/osgi.bnd
@@ -54,7 +54,6 @@
 # for reproducible build (see https://bnd.bndtools.org/instructions/reproducible.html 
 # and https://bnd.bndtools.org/instructions/noextraheaders.html)
 -reproducible: true
--noextraheaders: true
 
 # Non-OSGi meta:
 Main-Class: freemarker.core.CommandLine