multipy: relink against gtest (#280)

Summary:
Should fix regression in pytorch master https://hud.pytorch.org/minihud?name_filter=deploy

Pull Request resolved: #280

Test Plan:
CI

```
rm -r build; cmake -S . -B build; and cmake --build build/ --config Release -j -t multipy_pybind
```

Reviewed By: kit1980, PaliC

Differential Revision: D42052758

Pulled By: d4l3k

fbshipit-source-id: cda42b60872b337cbae8f22ab6d43da2c87279d4

multipy/runtime/interpreter/CMakeLists.txt

@@ -80,5 +80,6 @@ target_include_directories(torch_deployinterpreter PRIVATE ${INTERPRETER_DIR})
 target_include_directories(torch_deployinterpreter BEFORE PUBLIC ${Python3_INCLUDE_DIRS})
 
 target_link_libraries(torch_deployinterpreter PRIVATE fmt::fmt-header-only)
+target_link_libraries(torch_deployinterpreter PRIVATE gtest)
 target_link_libraries(torch_deployinterpreter PRIVATE torch_python)
 target_link_libraries(torch_deployinterpreter PRIVATE multipy_torch)