Recommended cpu detection change

src/freedombone-utils-nodejs

 function nodejs_fix_cpu_detection {
     # fix for failing cpu detection during image build with qemu, see https://github.com/npm/npm/issues/19265
     if [ -f "$rootdir/usr/lib/node_modules/npm/node_modules/worker-farm/lib/farm.js" ]; then
-        sed -i "s|require('os').cpus.*|1|g" "$rootdir/usr/lib/node_modules/npm/node_modules/worker-farm/lib/farm.js"
+        sed -i "s|require('os').cpus().length|(require('os').cpus() || { length: 1 }).length|g" "$rootdir/usr/lib/node_modules/npm/node_modules/worker-farm/lib/farm.js"
     fi
     if [ -f "$rootdir/.npm-global/lib/node_modules/npm/node_modules/worker-farm/lib/farm.js" ]; then
-        sed -i "s|require('os').cpus.*|1|g" "$rootdir/.npm-global/lib/node_modules/npm/node_modules/worker-farm/lib/farm.js"
+        sed -i "s|require('os').cpus().length|(require('os').cpus() || { length: 1 }).length|g" "$rootdir/.npm-global/lib/node_modules/npm/node_modules/worker-farm/lib/farm.js"
     fi
     # installing worker farm fixes the cpu detection bug
     $mesh_install_nodejs_prefix npm install --arch=$NPM_ARCH -g worker-farm@1.6.0 --save