Add SPDX tags to get_cpm.cmake to comply with MIT #496
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Add SPDX licensing/copyright tags to the
get_cpm.cmake
script, so that anybody that copies theget_cpm.cmake
script into their repo (following the instructions in the README.md) will automatically comply with CPM's MIT license.It's possible that we could just copy the entire MIT License info over (aka like what
cmake/CPM.cmake
does, but most modern open-source projects (like the Linux kernel) just use SPDX tags to keep things simpler.