Don't export iio_context_create_from_backend as API function
Don't export iio_context_create_from_backend as API function

As far as I know it is not used anywhere outside libiio; so keep it
private a bit longer until we have a plug-in system that's robust
enough to have actual implementations.

Signed-off-by: Paul Cercueil <a027184a55211cd23e3f3094f1fdc728df5e0500@crapouillou.net>

analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio