remove alwayslink/link_whole from //c10 library (#70997)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70997
This is no longer necessary because the sublibraries that need this
have it specified.
ghstack-source-id: 147786997
Test Plan: Verified manually that this works with Bazel and Buck.
Reviewed By: malfet
Differential Revision: D33477915
fbshipit-source-id: f00f8ac24747711904fe49df4fc9400beec54f3b
(cherry picked from commit 3325437d2b20c398e3edfb389d6d3d3e6ce74d93)
