Ensure npm version doesn't get reverted

src/freedombone-utils-nodejs

     get_npm_arch
     chroot "$rootdir" npm install --arch=$NPM_ARCH -g n@${NODEJS_N_VERSION} --save
     chroot "$rootdir" n --arch $N_ARCH ${NODEJS_VERSION}
+    chroot "$rootdir" npm install -g --arch $NPM_ARCH npm@${NPM_VERSION} --save
 }
 
 function remove_nodejs {