Fix UseLocalCompiler.Directory.Build.props (#17542)

Author: T-Gro

UseLocalCompiler.Directory.Build.props

@@ -8,6 +8,8 @@
 
     <DisableImplicitFSharpCoreReference>true</DisableImplicitFSharpCoreReference>
     <DisableAutoSetFscCompilerPath>true</DisableAutoSetFscCompilerPath>
+    <FscToolPath Condition="'$(FscToolPath)' == ''">$([System.IO.Path]::GetDirectoryName($(DOTNET_HOST_PATH)))</FscToolPath>
+    <FscToolExe Condition="'$(FscToolExe)' == ''">$([System.IO.Path]::GetFileName($(DOTNET_HOST_PATH)))</FscToolExe>
 
     <DotnetFscCompilerPath>$(LocalFSharpCompilerPath)/artifacts/bin/fsc/$(LocalFSharpCompilerConfiguration)/net9.0/fsc.dll</DotnetFscCompilerPath>
     <Fsc_DotNET_DotnetFscCompilerPath>$(LocalFSharpCompilerPath)/artifacts/bin/fsc/$(LocalFSharpCompilerConfiguration)/net9.0/fsc.dll</Fsc_DotNET_DotnetFscCompilerPath>