py: Use ln --relative to create symlinks

We create symlinks from the Python bindings build dir to the source dir
so that 1) the build dir can be used to use the bindings, and 2) to
allow modifications of the source .py files to be used right away
without rebuilding.

The symlinks were recently fixed and changed to use absolute paths.
However, absolute paths ruin one main use case I have: using the
bindings from the build dir via nfs from an ARM device.

So move back to relative paths, but accomplish this with the --relative
parameter for ln, instead of guessing the right relative path as was
done before the above-mentioned fix.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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