Win32 libltdl issue

[Howard Chu]

The definition of LT_SCOPE in libltdl/ltdl.h needs a tweak; if some 
other DLL (e.g. module 'foo') uses libltdl then it needs to define 
LIBLTDL_DLL_IMPORT. Since 'foo' is compiled as a DLL, DLL_EXPORT will 
already be automatically defined, resulting in LT_SCOPE getting defined 
twice. A quick solution is just to undef it before the second definition:

--- ltdl.h.O    2001-08-13 10:25:49.000000000 -0700
+++ ltdl.h      2005-04-26 05:20:45.044139776 -0700
@@ -131,6 +131,7 @@
 #      define LT_SCOPE __declspec(dllexport)
 #    endif
 #    ifdef LIBLTDL_DLL_IMPORT  /* define if linking with this dll */
+#      undef LT_SCOPE
 #      define LT_SCOPE extern __declspec(dllimport)
 #    endif
 #  endif

This situation is quite ugly because it means the user's *code* has to 
know whether they are linking against a shared or static libltdl, and 
it's just not possible to determine this dynamically/automatically at 
compile time.

Since LT_SCOPE is only used for the three lt_*alloc/free function 
pointers, I suggest removing these declarations completely and using 
accessor functions to set/get their values.

--
  -- Howard Chu
  Chief Architect, Symas Corp.       Director, Highland Sun
  http://www.symas.com               http://highlandsun.com/hyc
  Symas: Premier OpenSource Development and Support