Don't build host tools when building the cross-os DACs (#112454)

* Don't build host tools when building the cross-os DACs

* Update Microsoft.CrossOsDiag.Private.CoreCLR.proj

Author: jkoritzinsky

src/coreclr/.nuget/Microsoft.CrossOsDiag.Private.CoreCLR/Microsoft.CrossOsDiag.Private.CoreCLR.proj

@@ -32,7 +32,8 @@
       <_CrossOSDacProject Include="@(SupportedRid->'$(RepoRoot)Build.proj')"
                           AdditionalProperties="TargetOS=%(TargetOS);
                                                 TargetArchitecture=%(TargetArchitecture);
-                                                Subset=linuxdac+alpinedac" />
+                                                Subset=linuxdac+alpinedac;
+                                                BuildHostTools=false" />
       <_RuntimePrereqsProject Include="$(CoreClrProjectRoot)runtime-prereqs.proj" />
     </ItemGroup>