SUB & FUNCTION when declaring dynamic library

[SpriggsySpriggs]

I often declare external functions as both SUBs and FUNCTIONs (QB64 does not care if you have a SUB and a FUNCTION with the same name), depending on whether or not I'll need to keep the return value. Rather than just make a throwaway temp variable for the function, I'll use it as a SUB and get the same functionality. It boils down to preference on some stuff.