build: Use new ++ decoration to ensure literal is included

Since this is the RC build stream, we just duplicate the
`-conditionalpackage+` value into `-conditionalpackage++`.

This duplication is not harmful and will allow the build to operate in subsequent iterations if needed.

Signed-off-by: BJ Hargrave <bj@hargrave.dev>

cnf/build.bnd

@@ -40,6 +40,8 @@ Bundle-Version:         ${base.version}.${tstamp}-SNAPSHOT
 
 -conditionalpackage+: \
     =!aQute.lib.exceptions.*
+-conditionalpackage++: \
+    =!aQute.lib.exceptions.*
 
 -testpath+: \
     "{aQute.libg}";version=project;packages="!aQute.lib.exceptions.*,*",\