Balint Reczey 646a88b5ee Use xz -T4 -0 instead of pxz
Test showed very little difference in file-size between -0 and -9 while
both compression and decompression need much less memory and compression
needs less CPU time for -0.

Supported xz versions before 5.2 also accept the -T4 option but ignore it.

Also depend on xz-utils instead of downloading pxz.

LP: #1701132
2017-12-05 22:40:35 +01:00
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2017-12-05 22:40:35 +01:00