Whatever you've added in /etc/rc.local needs to be removed.
Get another SDCard and a USB reader.
Build plain Raspbian 2017-11-29 on the SDCard and boot that in your RPi.
Mount the broken card in an adapter, mount the adapter in the USB reader, mount the USB reader in your RPi.
You can then mount the root filesystem, edit /etc/rc.local to undo the damage. Shutdown cleanly then swap cards back.
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