[rfc] simply the rhino class rewriter

[Matthias Klose]

I have seen early build failures in rewriting the rhino jar file on
architectures like sh, mips, s390, sometimes on sparc64 too.  I don't think it's
essential to stress the stage1 VM with concurrent features, so simplifying it
should make the bootstrap more robust. Currently applying at least this for
distro builds. This, or something simpler, should go to all open branches.

  Matthias

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