Simplified paths to the foreign libraries; use gsl-config for header
The paths to the foreign libraries have been simplified, making use of CFFI's statement "Most, if not all, Lisps supported by CFFI have a reasonable default search algorithm for foreign libraries." Therefore, the paths have been eliminated. If they need to be added, this should be done by modifying the variable cffi:*foreign-library-directories*. The header files location set with cc-flags for Darwin has been changed to use (gsl-config "--cflags").
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