Remove unreferenced CMakeLists.txt for ReactCommon/jsc (#52078)

Summary:
Pull Request resolved: #52078

This Cmake file is not imported anymore and can be removed now.

Changelog:
[Internal] [Changed] -

Reviewed By: cipolleschi

Differential Revision: D76808417

fbshipit-source-id: 81824c7c46080bc16c891b5c11c3a8946f16c1b9

Author: cortinico