Mike Gelfand c5b1df0daa Support in-source builds (#4955) ...

* Support in-source builds

Don't copy third-party directories into themselves (actually, don't copy
them at all) by switching from `URL` to `SOURCE_DIR`. Separate build,
source, and install directories for third-party libraries.

* Trigger builds on changes to cmake/

That directory contains TrMacros.cmake which influences build logic in
other places.

2023-02-19 16:10:25 +00:00

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