fem: osx: try to fix default ccx detection
Created by: looooo
@berndhahnebach I tested this and it seems to work on osx. The real problem was related to wrong bytes->unicode decoding. But I also changed another line to use "ccx" (the command) instead of "path/to/ccx". To me this seems like the better approach as we test if the ccx command is available (so we should also use it).
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