add torch_cpu to the static library list in TorchConfig.cmake.in (#30769)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30769
The TorchConfig.cmake is the public cmake we produce in install folder for
3rd party client code to get all libtorch dependencies easily.
Apparently this build flow is not well covered by our CI (which is focused
on 1st party build / shared libraries?) as the little dummy project for
code analysis testing purpose was broken by #30315 without fail any CI.
Fixed the problem for mobile build and add the dummy project build to mobile
CI as well.
Test Plan: - make sure new CI pass;
Differential Revision: D18825054
Pulled By: ljk53
fbshipit-source-id: 80506f3875ffbc1a191154bb9e3621c621e08b12
