pass through *EXITCODE *EXITCODE__TRYRUN_OUTPUT variables (#49646)
Summary:
This is needed to allow cross compiling to work
There are some `try_run` statements in CMake files used for building pytorch and dependencies. Since we are cross compiling, there's no way to run the compiled executables to get the output for `try_run` function. CMake provides a solution to this by requiring the user to manually provide the exitcode and the output of the executable which should be given by `*EXITCODE` and `*EXITCODE__TRYRUN_OUTPUT` respectively.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/49646
Reviewed By: heitorschueroff
Differential Revision: D29960301
Pulled By: malfet
fbshipit-source-id: b10ab9c182d1220f7e1911f922e7db261d521145
