message: Move back to including <windows.h>
diff: #ifndef _WIN32
  #include <dlfcn.h>
  #else
  -// we copy a trick from concurrentqueue, this is brilliant:
  -// No sense pulling in windows.h for this, we'll manually declare the functions
  -// we use and rely on backwards-compatibility for this not to break
  -extern "C" __declspec(dllimport) void *__stdcall LoadLibrary(const char *);
  -extern "C" __declspec(dllimport) void *__stdcall LoadLibrary(void *, const char *);
  -
  -#define RTLD_LAZY 0
  -#define RTLD_LOCAL 0
  +#include <windows.h>
  #endif
  namespace duckdb {
  