go to definition not work for system libs

[clor09]

Environment data

• VS Code version: m using the oss version, 1.39.2
• Extension version (available under the Extensions sidebar): 2019.10.44104 (not sure if this is the version num? strange schema)
• OS and version: archlinux
• Python version (& distribution if applicable, e.g. Anaconda): 3.7.4
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): N/A
• Relevant/affected Python packages and their versions: all
• Jedi or Language Server? (i.e. what is "python.jediEnabled" set to; more info How to update the language server to the latest stable version vscode-python#3977): Language Server

Expected behaviour

e.g: In builtin socketserver, when ctrl+click on the UDPServer in sentence class ThreadingUDPServer(ThreadingMixIn, UDPServer): pass, vsc should bring me to UDPServer definition, but it not

Actual behaviour

As descripted in Expected behaviour, but Jedi worked in that situation

Steps to reproduce:

1. create a py file anywhere. import socketserver(or any other py builtin std library) at the header of this file
2. write some code, e.g
   class TestServer(socketserver.ThreadingTCPServer): pass
3. follow this path, go to ThreadingTCPServer definition -> go to TCPServer definition

Logs

seems got no error

User belongs to experiment group 'ShowPlayIcon - start'
User belongs to experiment group 'ShowExtensionSurveyPrompt - control'
User belongs to experiment group 'LS - control'
> conda --version
> pyenv root
> python3.7 -c "import sys;print(sys.executable)"
> python3.6 -c "import sys;print(sys.executable)"
> python3 -c "import sys;print(sys.executable)"
> python2 -c "import sys;print(sys.executable)"
> python -c "import sys;print(sys.executable)"
> python -c "import sys;print(sys.executable)"
> conda info --json
Starting Microsoft Python language server.
> conda info --json
> conda --version

no output in Developer Tools panel

[jakebailey]

Duplicate of #840. Navigation/hover/completion/etc not working outside the workspace is the current expected behavior.