Omnisharp does not start when ran from WSL / fedoraremix

## Environment data
`dotnet --info` output:
```
.NET SDK (reflecting any global.json):
Version: 5.0.206
Commit: 0cf287db1b

Runtime Environment:
OS Name: fedoraremixforwsl
OS Version: 34
OS Platform: Linux
RID: fedora.34-x64
Base Path: /usr/lib64/dotnet/sdk/5.0.206/

Host (useful for support):
Version: 5.0.9
Commit: 208e377a53

.NET SDKs installed:
5.0.206 [/usr/lib64/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 5.0.9 [/usr/lib64/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 5.0.9 [/usr/lib64/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET runtimes or SDKs:
https://aka.ms/dotnet-download
```
VS Code version: `1.61.0`
C# Extension version: `v1.23.16`

## OmniSharp log
```
[2021-10-12 20:49:06.235] [exthost] [info] extension host started
[2021-10-12 20:49:06.255] [exthost] [info] ExtensionService#_doActivateExtension vscode.debug-auto-launch, startup: true, activationEvent: '*'
[2021-10-12 20:49:06.255] [exthost] [info] ExtensionService#loadCommonJSModule file:///home/marcin/.vscode-server/bin/ee8c7def80afc00dd6e593ef12f37756d8f504ea/extensions/debug-auto-launch/dist/extension
[2021-10-12 20:49:06.258] [exthost] [info] ExtensionService#_doActivateExtension vscode.git, startup: true, activationEvent: '*', root cause: vscode.github
[2021-10-12 20:49:06.258] [exthost] [info] ExtensionService#loadCommonJSModule file:///home/marcin/.vscode-server/bin/ee8c7def80afc00dd6e593ef12f37756d8f504ea/extensions/git/dist/main
[2021-10-12 20:49:06.302] [exthost] [info] Lock '/home/marcin/.vscode-server/data/User/workspaceStorage/2c8fb4a91ec52caf278ca648ccffa1aa/vscode.lock': Lock acquired.
[2021-10-12 20:49:06.461] [exthost] [info] ExtensionService#_doActivateExtension vscode.github, startup: true, activationEvent: '*'
[2021-10-12 20:49:06.461] [exthost] [info] ExtensionService#loadCommonJSModule file:///home/marcin/.vscode-server/bin/ee8c7def80afc00dd6e593ef12f37756d8f504ea/extensions/github/dist/extension.js
[2021-10-12 20:49:06.507] [exthost] [info] ExtensionService#_doActivateExtension vscode.emmet, startup: false, activationEvent: 'onStartupFinished'
[2021-10-12 20:49:06.507] [exthost] [info] ExtensionService#loadCommonJSModule file:///home/marcin/.vscode-server/bin/ee8c7def80afc00dd6e593ef12f37756d8f504ea/extensions/emmet/dist/node/emmetNodeMain
[2021-10-12 20:49:06.518] [exthost] [info] ExtensionService#_doActivateExtension vscode.merge-conflict, startup: false, activationEvent: 'onStartupFinished'
[2021-10-12 20:49:06.518] [exthost] [info] ExtensionService#loadCommonJSModule file:///home/marcin/.vscode-server/bin/ee8c7def80afc00dd6e593ef12f37756d8f504ea/extensions/merge-conflict/dist/mergeConflictMain
[2021-10-12 20:49:06.521] [exthost] [info] eager extensions activated
[2021-10-12 20:49:06.540] [exthost] [info] ExtensionService#_doActivateExtension ms-vscode.js-debug, startup: false, activationEvent: 'onCommand:extension.js-debug.clearAutoAttachVariables'
[2021-10-12 20:49:06.540] [exthost] [info] ExtensionService#loadCommonJSModule file:///home/marcin/.vscode-server/bin/ee8c7def80afc00dd6e593ef12f37756d8f504ea/extensions/ms-vscode.js-debug/src/extension.js
[2021-10-12 20:49:41.891] [exthost] [info] ExtensionService#_doActivateExtension vscode.configuration-editing, startup: false, activationEvent: 'onLanguage:json'
[2021-10-12 20:49:41.891] [exthost] [info] ExtensionService#loadCommonJSModule file:///home/marcin/.vscode-server/bin/ee8c7def80afc00dd6e593ef12f37756d8f504ea/extensions/configuration-editing/dist/configurationEditingMain
[2021-10-12 20:49:41.894] [exthost] [info] ExtensionService#_doActivateExtension vscode.extension-editing, startup: false, activationEvent: 'onLanguage:json'
[2021-10-12 20:49:41.894] [exthost] [info] ExtensionService#loadCommonJSModule file:///home/marcin/.vscode-server/bin/ee8c7def80afc00dd6e593ef12f37756d8f504ea/extensions/extension-editing/dist/extensionEditingMain
[2021-10-12 20:49:41.905] [exthost] [info] ExtensionService#_doActivateExtension vscode.json-language-features, startup: false, activationEvent: 'onLanguage:json'
[2021-10-12 20:49:41.905] [exthost] [info] ExtensionService#loadCommonJSModule file:///home/marcin/.vscode-server/bin/ee8c7def80afc00dd6e593ef12f37756d8f504ea/extensions/json-language-features/client/dist/node/jsonClientMain
[2021-10-12 20:49:41.945] [exthost] [info] ExtensionService#_doActivateExtension vscode.npm, startup: false, activationEvent: 'onLanguage:json'
[2021-10-12 20:49:41.945] [exthost] [info] ExtensionService#loadCommonJSModule file:///home/marcin/.vscode-server/bin/ee8c7def80afc00dd6e593ef12f37756d8f504ea/extensions/npm/dist/npmMain
[2021-10-12 20:49:44.945] [exthost] [info] ExtensionService#_doActivateExtension ms-dotnettools.csharp, startup: false, activationEvent: 'workspaceContains:project.json,*.csproj,*.sln,*.slnf,*.csx,*.cake,**/*.csproj,**/*.sln,**/*.slnf,**/*.csx,**/*.cake'
[2021-10-12 20:49:44.945] [exthost] [info] ExtensionService#loadCommonJSModule file:///home/marcin/.vscode-server/extensions/ms-dotnettools.csharp-1.23.16/dist/extension
[2021-10-12 20:49:45.065] [exthost] [error] Activating extension ms-dotnettools.csharp failed due to an error:
[2021-10-12 20:49:45.065] [exthost] [error] TypeError: Cannot read property 'isWindows' of undefined
at /home/marcin/.vscode-server/extensions/ms-dotnettools.csharp-1.23.16/dist/extension.js:2:672818
at Generator.throw ()
at a (/home/marcin/.vscode-server/extensions/ms-dotnettools.csharp-1.23.16/dist/extension.js:2:670153)
```

## Steps to reproduce
1. I'm running WSLv2 with latest `fedoraremix 34.5.6 Final` (https://github.com/WhitewaterFoundry/Fedora-Remix-for-WSL)
2. I'm runnig VSCode from WSL
3. I installed C# extension in WSL

## Expected behavior
Omnisharp should initialize and provide intellisense.

## Actual behavior
Omnisharp does not initialize, and there's the `Cannot read property 'isWindows' of undefined` error in the log. Seems like Omnisharp is unable to identify the platform when ran from `fedoraremix`. I'm seeing no such issued when I run the same steps with Ubuntu 20.04 LTS.