[Upstream] Stop ARM boards crashing with CUPS is loaded

[Lee Jones]

This is a multi-part message in MIME format.Please find attached a patch which rectifies the following bug.

When CUPS loads, it tries to load several drivers that it may need.
When one of these drivers, specifically parport_pc is loaded on ARM
based systems, it causes a segmentation fault as the address is not
writable on non-PC based architectures. This code prevents this
driver from being compiled on said architectures.

Kind regards,
Lee