Revert "CLJCLR-195: Support for runtime async/await interop (.NET 11 preview) -- this commit is the second one, just filling in some missing .csproj properties."

This reverts commit 87557d7.

Author: dmiller

Clojure/Clojure.Compile/Clojure.Compile.csproj

@@ -7,7 +7,6 @@
     <StartupObject>BootstrapCompile.Compile</StartupObject>
 	  <EnableUnsafeBinaryFormatterSerialization>true</EnableUnsafeBinaryFormatterSerialization>
 	  <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
-	  <EnablePreviewFeatures>True</EnablePreviewFeatures>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">

Clojure/Clojure.Main/Clojure.Main.csproj

@@ -8,7 +8,6 @@
 	 <PackAsTool>true</PackAsTool>
 	 <EnableUnsafeBinaryFormatterSerialization>true</EnableUnsafeBinaryFormatterSerialization>
 	  <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
-	  <EnablePreviewFeatures>True</EnablePreviewFeatures>
   </PropertyGroup>
 
 	<PropertyGroup>

Clojure/Clojure.Tests.Support/Clojure.Tests.Support.csproj

@@ -4,7 +4,6 @@
 	  <TargetFrameworks>net6.0;net8.0;net9.0;net10.0;net11.0;net462;net481</TargetFrameworks>
 	  <LangVersion>14.0</LangVersion>
 	  <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
-	  <EnablePreviewFeatures>True</EnablePreviewFeatures>
   </PropertyGroup>
 
   <ItemGroup>

Clojure/Csharp.Tests/Csharp.Tests.csproj

@@ -7,7 +7,6 @@
     <IsTestProject>true</IsTestProject>
 	  <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
 	  <NoWarn>CS8002</NoWarn>
-	  <EnablePreviewFeatures>True</EnablePreviewFeatures>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(TargetFramework)' == 'net11.0'">