llmodel: add CUDA to the DLL search path if CUDA_PATH is set (#2357)

Signed-off-by: Jared Van Bortel <jared@nomic.ai>

gpt4all-backend/dlhandle.h

@@ -58,14 +58,15 @@ public:
 #include <string>
 #include <exception>
 #include <stdexcept>
+
+#define WIN32_LEAN_AND_MEAN
 #ifndef NOMINMAX
-    #define NOMINMAX
+#   define NOMINMAX
 #endif
 #include <windows.h>
 #include <libloaderapi.h>
 
 
-
 class Dlhandle {
     HMODULE chandle;