Attempt to fix the extension not finding Mono

[ArtyIF]

Should fix #5454

[ArtyIF]

@microsoft-github-policy-service agree

[filipw]

Thanks this seems good to me.
The older MSBuilds only support single dash args like -version. The newer ones (16.10+) support both --version and -version so of course it makes sense to use the ones that have wider compatibility.

Tagging @333fred @JoeRobich @dibarbet

[dibarbet]

Makes sense to me. I'll make sure this in the next release.

[RaulPROP]

On Ubuntu (22.04 at least), there is also another problem: the msbuild command is a subcommand of dotnet. So to get the version the correct command should be dotnet msbuild -version -nologo.

[333fred]

@RaulPROP mono msbuild is not a subcommand of dotnet, which is what this is looking for.

[ArtyIF]

On Ubuntu (22.04 at least), there is also another problem: the msbuild command is a subcommand of dotnet. So to get the version the correct command should be dotnet msbuild -version -nologo.

This function is only called with useModernNet set to false, i.e. when using Mono instead of .NET 5+ SDK.