Commits on Sep 3, 2021

1. pyo3-build-config: conditionalize symbols on resolve-config feature …

   PR PyO3#1856 was buggy in that the `pyo3-build-config` crate didn't actually
   work in library mode because `include_str!()` was attempting to resolve
   missing files as part of populating some `const` values.
   
   We could change the logic of these constants to make them lazy if
   we wanted to support possibly getting access to the value. But the
   simple solution is to conditionalize their presence on the crate
   feature.
   
   Test coverage for building and testing the crate in insolation with the
   feature disabled has been added.
   
   Various code has been conditionalized to avoid compiler warnings.
   
   Also, it appears `cargo build|test -p pyo3-build-config
   --no-default-features` still passes default features. This seems wrong
   to me. But it is how my system behaves. Maybe it is an sccache bug?
   I coded the new tests to `cd pyo3-build-config` first to work around.

   

   indygreg committed Sep 3, 2021
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