add .xz support for h2ext to be able to build from tar.xz templates #24
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magic taken from
https://github.com/file/file/blob/FILE5_24/magic/Magdir/compress#L202-L205
however due limited support of magic format in util-vserver had to hack
some things:
$ head -c6 < pld32.tar.xz|od -cx
0000000 375 7 z X Z \0
37fd 587a 005a