[pytorch] fix BUILD_CAFFE2_MOBILE gating around caffe2/operators/experimental/c10/cpu (#34354)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/34354
The condition `NOT INTERN_BUILD_MOBILE AND NOT BUILD_CAFFE2_MOBILE` was
added in #27086, but seems it's always false on current master:
BUILD_CAFFE2_MOBILE is ON by default - the name is a little bit misleading -
it is ON even when it's building non-mobile PyTorch/Caffe2. It is OFF only
when it's building PyTorch mobile, where INTERN_BUILD_MOBILE is ON.
And when it's building PyTorch mobile, it won't build caffe2/operators
at all (by setting BUILD_CAFFE2_OPS OFF: https://github.com/pytorch/pytorch/blob/master/CMakeLists.txt#L345)
So I imagine the real intention is to skip when it's building Caffe2 mobile.
We can simply remove the deprecating BUILD_CAFFE2_MOBILE condition.
Test Plan: Imported from OSS
Differential Revision: D20345298
Pulled By: ljk53
fbshipit-source-id: d2cb4e2248fc209d63b2843e0f12e577e323def4
