10.7.6

   Maybe move some of the commandline options before loadStartup(), to make
   them work for init.lsp and linked programs ??? (not yet)

   Maybe add buffersize parameter to copy-file for faster copying ??? (not yet)

   Changed nl-import.c/ ffi_prep_closure to  ffi_prep_closure_loc to make compatible
   with macOS 10.15 Catalina.

   Outcomment "utf8 = utf8" which was necessary for older compilers.

   Fixed char() for '(setf (j (char (str 2))) 2)'
   'j' is a numerical array and 'str' is a string
   If char() retuns a number stringCell should be NULL

   Problem with > (push x x) > (first x) > (x 0) > x
   see: http://www.newlispfanclub.alh.net/forum/viewtopic.php?f=2&p=25095#p25095
   (not fixed yet)

   fixed struct return error nl-import.c line 814