--codepage on coreclr F# compiler is incompatible with desktop compilers implementation

[KevinRansom]

repro:
1. Create new console app:

dotnet new console -lang:F#

2. Edit fsproj file to set codepage

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net472</TargetFramework>
    <CodePage>1250</CodePage>
  </PropertyGroup>

3. Build using dotnet build then msbuild (dotnet build runs coreclr f# compiler msbuild runs the desktop one.

C:\temp\repro>dotnet build /t:rebuild /v:q
MSBuild version 17.5.0-preview-22620-02+a6f6699d1 for .NET
FSC : error FS0193: No data is available for encoding 1250. For information on defining a custom encoding, see the documentation for the Encoding.RegisterProvider method. [C:\temp\repro\repro.fsproj]

Build FAILED.

FSC : error FS0193: No data is available for encoding 1250. For information on defining a custom encoding, see the documentation for the Encoding.RegisterProvider method. [C:\temp\repro\repro.fsproj]
    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:00.90

C:\temp\repro>msbuild /t:rebuild /v:q
MSBuild version 17.5.0-preview-23061-01+040e2a90e for .NET Framework

Expected: Both to succeed

[majocha]

Just because I've been googling this stuff:

System.Text.Encoding.CodePages enable creating single and double bytes encodings for code pages that otherwise are available only in the desktop .NET Framework.

https://www.nuget.org/packages/System.Text.Encoding.CodePages/#readme-body-tab