add noop macro for Parrot_mmd_cache_destroy for backwards compatibility
add noop macro for Parrot_mmd_cache_destroy for backwards compatibility

gitster/parrot,youprofit/parrot,gagern/parrot,gagern/parrot,gitster/parrot,parrot/parrot,tkob/parrot,tkob/parrot,gagern/parrot,gitster/parrot,FROGGS/parrot,gitster/parrot,gagern/parrot,FROGGS/parrot,FROGGS/parrot,tkob/parrot,gagern/parrot,youprofit/parrot,youprofit/parrot,FROGGS/parrot,parrot/parrot,tkob/parrot,FROGGS/parrot,youprofit/parrot,FROGGS/parrot,parrot/parrot,parrot/parrot,gagern/parrot,gagern/parrot,youprofit/parrot,gitster/parrot,youprofit/parrot,FROGGS/parrot,youprofit/parrot,gitster/parrot,tkob/parrot,gitster/parrot,parrot/parrot,FROGGS/parrot,tkob/parrot,tkob/parrot,tkob/parrot,youprofit/parrot