Add curl to XiaoFang Camera

1. Download binary here: https://github.com/death2all110/yi-hack/tree/master/sd/test
2. SFTP file to /media/mmcblk0p2/data/usr/bin/
3. chmod +x curl
4. done

References:

• https://web.archive.org/web/20170712052521/http://nemon.org/ipcam-ipr1631x/
• SDK: https://mega.nz/#!69tXHCAD!spJmcKzH3WUmOOyTMVxIc07N4m6Bu8m3ziDhURaKjgM
• SDK Build: https://github.com/cilynx/zm-w0002/blob/master/setup_toolchain.sh
• Original Wayback Machine: https://web.archive.org/web/20170712052521/http://nemon.org/ipcam-ipr1631x/