pkgdelta: Use high compression options offered by xdelta3

 * Add -9 which is the highest compression level.
 * Use lzma for secondary compression.

 Decompression speed is largely unaffected as most cycles are consumed
 by xz for re-compression.

 Some numbers:

 clang x86_64 [3.5.0-2.1 to 3.5.0-3]
 17.21MiB      default      (0.73)
 15.67MiB      -9           (0.67)
 13.59MiB      -9 -S djw    (0.58)
 12.01MiB      -9 -S lzma   (0.51)

 inkscape x86_64 [0.48.5-3 to 0.48.5-4]
 02.69MiB      default      (0.21)
 01.64MiB      -9           (0.13)
 01.30MiB      -9 -S djw    (0.10)
 01.01MiB      -9 -S lzma   (0.08)

Signed-off-by: Mohammad Alsaleh <CE.Mohammad.AlSaleh@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

0 files changed, 0 insertions, 0 deletions