* factored unix exports handling from t_bsd and t_linux into expunix unit

    (todo: at least solaris, maybe others)
  * changed the "exports" section handling:
    a) make everything private which is not exported (implemented for
       darwin and linux)
    b) for the exported symbols:
     - functions/procedures
      1) if no name or index is provided, and if the procedure has aliases
         defined via the public/export directives, then export the default
         mangled name and all defined aliases
      2) otherwise if no name is specified (but there is an index) then
        i) if the procedure is defined as cdecl/cppdecl/mwpascal, use the
           appropriately mangled version of the function name
       ii) otherwise export the name without any mangling(e.g. "exports
           proc1" -> proc1 is the exported name)
     - variables
      1) if no name is provided and the variable was specified as cvar,
         use the mangled name
      2) otherwise if no name is provided, export the name without any
         mangling
  -> initialization/finalization of shared libraries under Linux works
     again (mantis #7838)
  -> sharing symbols between shared library and main program works
     under Linux (mantis #9089)


git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@10551 3ad0048d-3df7-0310-abae-a5850022a9f2

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