Revert "export AOTI_TORCH_EXPORT on Windows. (pytorch#140030)"

This reverts commit 7a9d0e3.

Reverted pytorch#140030 on behalf of https://github.com/facebook-github-bot due to Diff reverted internally ([comment](pytorch#140030 (comment)))

torch/csrc/inductor/aoti_torch/c/shim.h

@@ -40,11 +40,12 @@
 #define AOTI_TORCH_EXPORT __attribute__((__visibility__("default")))
 #else // !__GNUC__
 #ifdef _WIN32
-// PyTorch2 doesn't currently work on Windows. But, we still need to export aoti
-// functions. If we didn't export these functions, it will cause the inductor
-// failed, please issue: https://github.com/pytorch/pytorch/issues/139954
-// TODO: We can only show message when aoti runtime, but not compiling time.
-#define AOTI_TORCH_EXPORT __declspec(dllexport)
+// PyTorch2 doesn't currently work on Windows. Exporting these APIs can lead
+// to symbol clashes at link time if libtorch is included in a DLL and binary
+// that depends on the DLL. As a short term fix, we don't export the symbols.
+// In the long term, this will need to be addressed when Windows is supported.
+// #define AOTI_TORCH_EXPORT __declspec(dllexport)
+#define AOTI_TORCH_EXPORT
 #else // !_WIN32
 #define AOTI_TORCH_EXPORT
 #endif // _WIN32