patgen SIGSEGV on aarch64-linux

[Karl Berry]

    -@!trie_size=100000000; {max space for pattern trie}
    -@!triec_size=50000000; {max space for pattern count trie, must be less than
    +@!trie_size=76000000; {max space for pattern trie}
    +@!triec_size=38000000; {max space for pattern count trie, must be less

Thanks Johannes. I installed that change. Hope it still flies for Keno. -k