Fix fsbv:defcfun call
The expansion of a foreign structure-by-value function did not substitute the foreign function name. It turns out this didn't matter because cffi::parse-name-and-options used by fsbv:defcfun simply ignored the symbol 'GSL-NAME for the foreign function name and pulled the actual name out of the symbol-name for the Lisp symbol of the function name. This fix makes it clearer in the macroexpansion however.
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