Changed corefx to libraries in System.Private.CoreLib (#532)
* Changed corefx to libraries
* Update src/libraries/System.Private.CoreLib/src/System/Runtime/Serialization/SerializationInfo.cs
Co-Authored-By: Stephen Toub <stoub@microsoft.com>
* Update src/libraries/System.Private.CoreLib/src/System/Runtime/Serialization/SerializationInfo.cs
Co-Authored-By: Stephen Toub <stoub@microsoft.com>
* Update src/libraries/System.Private.CoreLib/src/Interop/Unix/Interop.Errors.cs
Co-Authored-By: Stephen Toub <stoub@microsoft.com>
* Update src/libraries/System.Private.CoreLib/src/Internal/Win32/RegistryKey.cs
Co-Authored-By: Stephen Toub <stoub@microsoft.com>