[MSVC] Libfacedetection build failed due to error C2039: 'to_string': is not a member of 'std'

Description:
Recently, we updated the commit of bitcoin for MSVC RWC testing, it failed to build due to the error C2039 and error C3861 like below, could you please help take a look? Thanks.

F:\gitP\ShiqiYu\libfacedetection\src\facedetectcnn.cpp(638,17): error C2039: 'to_string': is not a member of 'std' [F:\gitP\ShiqiYu\libfacedetection\build_amd64\facedetection.vcxproj]
         F:\gitP\ShiqiYu\libfacedetection\src\facedetectcnn.cpp(638,26): error C3861: 'to_string': identifier not found [F:\gitP\ShiqiYu\libfacedetection\build_amd64\facedetection.vcxproj]

Expected behavior:
Build successfully.

Actual behavior:
Build failed with error C2039 and error C3861

To reprodece:

1. open VS2019 x64 Native Tools command.
2. git clone https://github.com/ShiqiYu/libfacedetection F:\gitP\ShiqiYu\libfacedetection
3. mkdir F:\gitP\ShiqiYu\libfacedetection\build_amd64 and cd F:\gitP\ShiqiYu\libfacedetection\build_amd64
4. cmake -G "Visual Studio 16 2019" -A x64 -DCMAKE_SYSTEM_VERSION=10.0.18362.0 -DCMAKE_INSTALL_PREFIX=install -DBUILD_SHARED_LIBS=ON -DCMAKE_BUILD_TYPE=Release -DDEMO=OFF ..
5. msbuild /m /p:Platform=x64 /p:Configuration=Release libfacedetection.sln /t:Rebuild

More info:
The commit of Libfacedetection we use: 4092665
VS version: VS2019 (v16.11.20)

Detailed log:
build.log

Start with src/facedetectcnn.cpp at line 638 and inspect the VS2019 build output in build.log. Reproduce the failure using the provided CMake and MSBuild commands, then verify that the libfacedetection.sln Release x64 rebuild completes successfully.