* CMake: Improve incremental build speed.
CMake automatically embeds an updated configure step into make/ninja that will be called during the build phase. By default if a `CMakeCache.txt` file exists in the build directory CMake will use it and this + `spec.is_develop` is sufficient evidence of an incremental build.
This PR removes duplicate work/expense from CMake packages when using `spack develop`.
* Update cmake.py
* [@spackbot] updating style on behalf of psakievich
* Update cmake.py
meant self not spec...
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Co-authored-by: psakievich <psakievich@users.noreply.github.com>
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