This fixes an issue existing in CCGV 5.19.

If you try to edit a special then you will get a blank screen due to a
PHP error. The function tep_set_coupon_status() is redefined when
tep_set_specials_status() is invoked, but it was already defined in
CCGV5.19/catalog/admin/includes/add_ccgvdc_application_top.php.

The fix is to remove the redundant function definition from
CCGV5.19/catalog/admin/includes/functions/general.php

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