Remove -march=native from Makefile
See https://github.com/ncmpcpp/ncmpcpp/blob/9f44edf0b1d74da7cefbd498341d59bc52f6043f/extras/Makefile#L2.
Also changes license from GPL to GPL-2.0-only, as seen in the repository.
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See https://github.com/ncmpcpp/ncmpcpp/blob/9f44edf0b1d74da7cefbd498341d59bc52f6043f/extras/Makefile#L2.
Also changes license from GPL to GPL-2.0-only, as seen in the repository.