xz instead of bzip2

[Matias Fonzo]

Dear GCC developers,

What happens here !

"Weekly snapshots now use xz compression [2017-05-24]
    ...instead of bzip2."

Are you aware that a better implementation / format exists for this
purposes?:

    http://lzip.nongnu.org/

Review of xz:

    http://lzip.nongnu.org/xz_inadequate.html


Please do the right thing..

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