Fix build

Disable warnings so we can build this without extensive customizations.

Disable the Hosting sample, which is a dependency of already-disabled
System.CommandLine.Hosting project.

Author: omajid

Directory.Build.props

@@ -6,6 +6,7 @@
 
   <PropertyGroup>
     <NoWarn>$(NoWarn);NU5125;CS0618</NoWarn>
+    <NoWarn Condition=" '$(DotnetBuildFromSource)' == 'true' ">$(NoWarn);CS8714;CS8765;CS8600;CS8601;CS8602;CS8603;CS8604</NoWarn>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
   </PropertyGroup>
 

eng/source-build-patches/0004-Exclude-System.CommandLine.Hosting.patch

@@ -20,6 +20,16 @@ index 7342c1c..e4a97a0 100644
    </PropertyGroup>
 
    <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
+--- a/samples/HostingPlayground/HostingPlayground.csproj
++++ b/samples/HostingPlayground/HostingPlayground.csproj
+@@ -6,6 +6,7 @@
+     <GenerateDocumentationFile>true</GenerateDocumentationFile>
+     <LangVersion>8</LangVersion>
+     <NoWarn>$(NoWarn);CS1591</NoWarn>
++    <ExcludeFromSourceBuild>true</ExcludeFromSourceBuild>
+   </PropertyGroup>
+ 
+   <ItemGroup>
 -- 
 2.25.2