Don't overwrite deployment options for non-iOS unix-platforms

A missing else was causing the else:unix-branch of the ios condition
to always execute for unix platforms, overwriting any of the
settings from before. Result was e.g. that Android builds would
not properly install their assets.

Change-Id: Icf8d2e77ff7eaea478cc2f945d3aee7929cc4078
Reviewed-by: Daniel Teske <daniel.teske@digia.com>