[pacman-dev] parallel compression in makepkg

[Alf Gaida]

Imho this could (should) be an experimental feature, turned on/off in 
makepkg.conf.

I have modified my packagers and now using pigz instead of gzip  and 
pxz instead of xz for a year without glitches and  errors. 

I think, both ways are simple and reliable, i prefer to change the tools 
and leave pacman and makepkg untouched.

And it speeds up compressing and decompressing a lot on my AMD 
965 ;)