[MSVC] ROOT builds under msvc option /permissive- with error C4576

[Zhaojun-Liu]

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Description

Hi:
I build ROOT on Windows with msvc and with option /permissive-, it issues error like below, could you take a look at this issue, thanks.
F:\gitP\root-project\root\tmva\tmva\inc\TMVA/RBatchGenerator.hxx(100,89): error C4576: a parenthesized type followed by an initializer list is a non-standard explicit type conversion syntax [F:\gitP\root-project\root\build_amd64\tmva\tmva\G__TMVA.vcxproj]

Workaround:
If I remove the brackets around the std::vector<std::size_t> in the line: https://github.com/root-project/root/blob/master/tmva/tmva/inc/TMVA/RBatchGenerator.hxx#L100, error will disappear.

Reproducer

Open a VS2022 x64 Native Tools command.

1. git clone https://github.com/root-project/root F:\gitP\root-project\root
2. git -C "F:\gitP\root-project\root" reset --hard 0d1f204
3. mkdir F:\gitP\root-project\root\build_amd64 and cd F:\gitP\root-project\root\build_amd64
4. python.exe -m pip install pytest
5. set CL=/permissive-
6. cmake -G "Visual Studio 17 2022" -A x64 -DCMAKE_SYSTEM_VERSION=10.0.22621.0 -DCMAKE_BUILD_TYPE=Release -Droofit=off -Dtesting=ON -Droottest=ON ..
7. msbuild /m /p:Platform=x64 /p:Configuration=Release ALL_BUILD.vcxproj /t:Rebuild

ROOT version

commit: 0d1f204

Installation method

build from source

Operating system

Windows

Additional context

build.log