Revert 'main: Remove unused function load_backend_new()'

This reverts commit 5ffbfffaf7758c33791978516d0a1100773b85e2.

Restore load_backend_new() for use with libweston backend configuration.

Signed-off-by: Bryce Harrington <bryce@osg.samsung.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
1 file changed