Currently we are building the grpc_csharp_ext.dll like this
```
set ARCHITECTURE=%1
call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat" %ARCHITECTURE%
set OpenSSLVer=Win32
if "%ARCHITECTURE%" == "x64" (
set OpenSSLVer=Win64
)
cmake -G Ninja -DCMAKE_C_COMPILER=cl.exe -DCMAKE_CXX_COMPILER=cl.exe -DCMAKE_BUILD_TYPE=RelWithDebInfo -DgRPC_SSL_PROVIDER:STRING=package -DOPENSSL_ROOT_DIR:PATH=c:\OpenSSL-%OpenSSLVer% -DgRPC_BUILD_TESTS=OFF -DgRPC_MSVC_STATIC_RUNTIME=ON ../../../..
cmake --build . --target grpc_csharp_ext
```
with small changes in the CMakeList.txt to link with static OpenSSL lib
```
target_link_libraries(grpc_csharp_ext
${_gRPC_ALLTARGETS_LIBRARIES}
${_gRPC_SSL_LIBRARIES}
gpr
grpc
)
```
This was working fine in version 1.28. Now we updated our soruces to 1.41 and the build of the dll failed with some Linker errors
```
upb.lib(text_encode.c.obj) : error LNK2019: unresolved external symbol upb_fielddef_isseq referenced in function txtenc_
msg
upb.lib(reflection.c.obj) : error LNK2001: unresolved external symbol upb_fielddef_isseq
upb.lib(text_encode.c.obj) : error LNK2019: unresolved external symbol upb_fielddef_ismap referenced in function txtenc_
msg
upb.lib(reflection.c.obj) : error LNK2001: unresolved external symbol upb_fielddef_ismap
upb.lib(text_encode.c.obj) : error LNK2019: unresolved external symbol upb_fielddef_msgsubdef referenced in function txt
enc_array
upb.lib(reflection.c.obj) : error LNK2001: unresolved external symbol upb_fielddef_msgsubdef
upb.lib(text_encode.c.obj) : error LNK2019: unresolved external symbol upb_fielddef_enumsubdef referenced in function tx
tenc_array
...
...
```
When running the `run_tests.py` it also failed with `Some tests failed`. Did something change between the versions for building the grpc_csharp_ext.dll?
