binary-dist: when using xz, use extreme compression.
When building a binary distribution with TAR_COMP=xz, using the -9e flag (extremely high compression) results in substantial savings: for the Mavericks builds, bzip2 scores in at about 120mb, while xz at level 9 scores about 60mb - a huge reduction! This of course takes significantly longer - but it does not affect decompression speed for end users, so it's certainly worth it. Signed-off-by: Austin Seipp <firstname.lastname@example.org>
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