Fix SDK downgrading Platforms package (dotnet/corefx#36981)

Commit migrated from https://github.com/dotnet/corefx/commit/dcd80906ded9fee765d7ce4de4d992d5108df63c

diff --git a/src/libraries/pkg/test/frameworkSettings/netcoreapp3.0/settings.targets b/src/libraries/pkg/test/frameworkSettings/netcoreapp3.0/settings.targets
index 201f244..afde20c 100644 (file)
--- a/src/libraries/pkg/test/frameworkSettings/netcoreapp3.0/settings.targets
+++ b/src/libraries/pkg/test/frameworkSettings/netcoreapp3.0/settings.targets
@@ -4,6 +4,7 @@
     <NETCoreAppMaximumVersion>3.0</NETCoreAppMaximumVersion>
     <!-- use the most recent MS.NETCore.App we have from upstack -->
     <RuntimeFrameworkVersion>$(MicrosoftNETCoreAppPackageVersion)</RuntimeFrameworkVersion>
+    <DisableImplicitNETCorePlatformsReference>true</DisableImplicitNETCorePlatformsReference>
   </PropertyGroup>
 
   <ItemGroup>