Compile on MacOS (arm64)

[dblock]

Trying to find a command-line unsmile, ended up trying to build this one on MacOS arm64.

/Users/dblock/source/libsmile/lib/backrefs.h:108:7: warning: no newline at end of file [-Wnewline-eof]

easily fixed

error: unknown argument: '-MMD'

Removed.

error: error reading '/Users/dblock/source/libsmile/lib/.decode.lo.d'

etc.

Maybe someone has a working Makefile?