build: no need any more to try both ninja and ninja-build
build: no need any more to try both ninja and ninja-build

We have the "ninja" variable. Use it.

Signed-off-by: Nadav Har'El <625169824b719df98706d88646d0aae6f368ae4d@cloudius-systems.com>

duarten/scylla,wildinto/scylla,victorbriz/scylla,capturePointer/scylla,asias/scylla,tempbottle/scylla,gwicke/scylla,dwdm/scylla,kjniemi/scylla,eklitzke/scylla,raphaelsc/scylla,scylladb/scylla,acbellini/scylla,eklitzke/scylla,shaunstanislaus/scylla,tempbottle/scylla,avikivity/scylla,aruanruan/scylla,asias/scylla,dwdm/scylla,rentongzhang/scylla,justintung/scylla,tempbottle/scylla,aruanruan/scylla,asias/scylla,guiquanz/scylla,scylladb/scylla,linearregression/scylla,linearregression/scylla,scylladb/scylla,senseb/scylla,kangkot/scylla,glommer/scylla,rluta/scylla,victorbriz/scylla,acbellini/scylla,stamhe/scylla,capturePointer/scylla,rluta/scylla,rentongzhang/scylla,glommer/scylla,phonkee/scylla,respu/scylla,shaunstanislaus/scylla,raphaelsc/scylla,senseb/scylla,acbellini/scylla,wildinto/scylla,duarten/scylla,capturePointer/scylla,stamhe/scylla,justintung/scylla,glommer/scylla,phonkee/scylla,shaunstanislaus/scylla,respu/scylla,scylladb/scylla,respu/scylla,avikivity/scylla,victorbriz/scylla,bowlofstew/scylla,wildinto/scylla,bowlofstew/scylla,avikivity/scylla,kjniemi/scylla,phonkee/scylla,kangkot/scylla,rentongzhang/scylla,guiquanz/scylla,linearregression/scylla,bowlofstew/scylla,gwicke/scylla,kangkot/scylla,rluta/scylla,stamhe/scylla,dwdm/scylla,kjniemi/scylla,aruanruan/scylla,justintung/scylla,raphaelsc/scylla,duarten/scylla,gwicke/scylla,eklitzke/scylla,senseb/scylla,guiquanz/scylla