Re: [OS-BUILD PATCHv2] redhat/kernel.spec.template: Parallelize compression

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From: Prarit Bhargava on gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/2254#note_1248227766

Oh!  I had no idea about -n!  Thanks for that.  I've updated the MR with a
much simpler approach.

I tested this by doing a build with 'xz -v' and I can see that it works as
expected:

```
<snip>
 25.1 %     420.1 KiB / 1,848.0 KiB = 0.227                   0:01
 99.1 %            24 B / 240.0 KiB = 0.000
 22.6 %     480.1 KiB / 1,872.0 KiB = 0.256
 86.1 %     360.1 KiB / 1,960.0 KiB = 0.184                   0:01
 59.7 %     720.1 KiB / 4,056.0 KiB = 0.178                   0:02
  5.9 %     480.1 KiB / 2,152.0 KiB = 0.223                   0:01
 56.7 %     660.1 KiB / 3,536.0 KiB = 0.187                   0:01
 58.9 %     960.1 KiB / 5,800.0 KiB = 0.166                   0:02
 27.2 %     420.1 KiB / 1,800.0 KiB = 0.233
 51.3 %     900.1 KiB / 5,128.0 KiB = 0.176                   0:02
 90.6 %     300.0 KiB / 1,560.0 KiB = 0.192
  0.8 %              24 B / 8,192 B = 0.003
 91.3 %       180.0 KiB / 936.0 KiB = 0.192
 87.2 %     840.1 KiB / 4,864.0 KiB = 0.173                   0:02
 77.0 %     780.1 KiB / 5,400.0 KiB = 0.144                   0:02
 71.8 %   1,020.1 KiB / 5,304.0 KiB = 0.192                   0:02
 12.8 %   1,140.1 KiB / 5,032.0 KiB = 0.227                   0:02
  1.0 %              24 B / 8,192 B = 0.003
  2.9 %             24 B / 16.0 KiB = 0.001
  0.9 %              24 B / 8,192 B = 0.003
  1.1 %             24 B / 16.0 KiB = 0.001
  7.3 %             24 B / 24.0 KiB = 0.001
  3.4 %             24 B / 16.0 KiB = 0.001
  1.0 %             24 B / 16.0 KiB = 0.001
  1.6 %             24 B / 16.0 KiB = 0.001
<snip>
```
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