#3 Backend should not link sanei_config2

[Mattias Ellert]

The sanei_config2 contains the parsing for SCSI scanner settings and
introduces an unwanted dependency on sanei_scsi routines, which at the
present gives undefined symbols when linking. No function in
sanei_config2 is called from the backend, so the easiest way to fix the
undefined symbols is to drop sanei_config2 from the linking.

Patch attached.

[Mattias Ellert]

Patch fixing the undefined symbols