This is a LD_PRELOAD library that hooks the uname function and changes the machine type to be 'armv7l'. The string is intentionally hardcoded for simplicity.
This exists to allow one to force pip to use a particular machine type when creating wheels.
LD_PRELOAD=/path/to/libfakearmv7l.so [command]
Stolen from https://geekscloud.wordpress.com/2012/09/06/faking-output-of-uname-command/
Unknown