pass compilation; fail linking to lib/libc10d.a

[davidmlw]

This change fixed the compilation errors reported in https://github.com/pytorch/examples/issues/1180 and similar the one mentioned in https://github.com/pytorch/examples/issues/1235.

But I found that the lib/libc10d.a is not found in the libtorch release https://pytorch.org/get-started/locally/ https://download.pytorch.org/libtorch/cu128/libtorch-cxx11-abi-shared-with-deps-2.7.0%2Bcu128.zip

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[Strivin0311]

Hi, thx for fixing the source code, and the targets become shared libraries, thus you need to further modify the CMakeLists.txt as:

- target_link_libraries(dist-mnist ${CMAKE_PREFIX_PATH}/lib/libc10d.a)
+ target_link_libraries(dist-mnist ${CMAKE_PREFIX_PATH}/lib/libc10.so)
+ target_link_libraries(dist-mnist ${CMAKE_PREFIX_PATH}/lib/libc10_cuda.so)

[msaroufim]

@davidmlw heads up I can't merge this unless you're comfortable signing the CLA