Removed prerelease build prop

Author: jamescrosswell

Directory.Build.props

@@ -21,9 +21,6 @@
     <!-- We need to support old stuff. Applications should definitely address these advisory warnings though. -->
     <NoWarn>$(NoWarn);NU1902;NU1903</NoWarn>
 
-    <!-- For Xcode 26 support in .NET 10 -->
-    <NoWarn>$(NoWarn);XCODE_26_0_PREVIEW</NoWarn>
-
     <!-- https://learn.microsoft.com/en-us/dotnet/core/compatibility/sdk/8.0/dotnet-restore-audit#version-introduced -->
     <WarningsNotAsErrors>NU1902;NU1903</WarningsNotAsErrors>