CMake: wrong parsing of the march= output
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Description
https://github.com/intel/hyperscan/blob/c00683d73916e39f01b0d418f686c8b5c379159c/CMakeLists.txt#L178-L207
Parsing of the `GNUCC_ARCH` above is buggy. As a temporary solution I would propose to fall back to `native` value by default. Or make it optional.
### Versions affected
- gcc 9.3.0
- Ubuntu 9.3.0-17ubuntu1~20.04
- cmake version 3.16.3
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