Delete the "Generating compatible code" message (#73554)

We no longer root all assemblies by default and we don't need to advertise the size switches to much. Also, we need to establish what switches we actually want to support (document on docs.microsoft.com) for real.

Author: MichalStrehovsky

src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.targets

@@ -39,8 +39,6 @@ The .NET Foundation licenses this file to you under the MIT license.
 
   <!-- Set up the defaults for the compatibility mode -->
   <PropertyGroup>
-    <_BuildingInCompatibleMode Condition="$(TrimmerDefaultAction) == '' and $(IlcGenerateStackTraceData) == '' and $(IlcDisableReflection) == ''">true</_BuildingInCompatibleMode>
-
     <IlcGenerateStackTraceData Condition="$(IlcGenerateStackTraceData) == ''">true</IlcGenerateStackTraceData>
     <IlcScanReflection Condition="$(IlcScanReflection) == ''">true</IlcScanReflection>
   </PropertyGroup>
@@ -266,8 +264,7 @@ The .NET Foundation licenses this file to you under the MIT license.
       Inputs="@(IlcCompileInput);@(RdXmlFile);%(ManagedBinary.IlcRspFile)"
       Outputs="%(ManagedBinary.IlcOutputFile)"
       DependsOnTargets="WriteIlcRspFileForCompilation;$(IlcCompileDependsOn)">
-    <Message Text="Generating native code" Condition="$(_BuildingInCompatibleMode) != 'true'" Importance="high" />
-    <Message Text="Generating compatible native code. To optimize for size or speed, visit https://aka.ms/OptimizeNativeAOT" Condition="$(_BuildingInCompatibleMode) == 'true'" Importance="high" />
+    <Message Text="Generating native code" Importance="high" />
 
     <Exec Command="&quot;$(IlcToolsPath)\ilc&quot; @&quot;$(NativeIntermediateOutputPath)%(ManagedBinary.Filename).ilc.rsp&quot;" />