External inputs are currently only supported for initial transaction creation functions. Extend `solving_data` arguments as necessary to support fee bumping wallet transactions with non-wallet inputs.

https://github.com/bitcoin/bitcoin/pull/17211#issuecomment-897653994
SCRIPT_VERIFY_NULLDUMMY = (1U << 4),
    
    SCRIPT_VERIFY_SIGPUSHONLY = (1U << 5),
    
    
    
    
    SCRIPT_VERIFY_MINIMALDATA = (1U << 6),
    
    
    
    
    
    
    
    
    
    
    SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS  = (1U << 7),
    
    
    
    
    
    
    
    SCRIPT_VERIFY_CLEANSTACK = (1U << 8),