cmake: Only write config.hpp when changed #203
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By using `file(CONFIGURE)` instead of `file(WRITE)`, the file output will only be written if it has changed. This allows for running `cmake` to pick up other (possible) changes without triggering a full rebuild as happens when the `config.hpp` file has changed.
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By using
file(CONFIGURE)instead offile(WRITE), the file output will only be written if it has changed. This allows for runningcmaketo pick up other (possible) changes without triggering a full rebuild as happens when theconfig.hppfile has changed.