Implement configuration of 'arc' location at slave level rather than master level

[arcadien]

We are using build nodes under Windows and Linux. It the master setup, we cannot set '/usr/bin/arc' because it will fail under Windows. We cannot set 'c:\tools\arc' because it will break under Linux.
Without any configuration, 'arc' only fails under Windows, which need at least 'arc.bat'.
The solution we used is to set 'arc.bat' in the master configuration. Then make a symlink under Linux, from arc binary to arc.bat binary.
This is working but look a wild boar solution.
Would it be possible to change the implementation of the plugin so that the configuration is more portable?

[withinfocus]

Seconded. Multi-platform support doesn't work since arcanist's location could be entirely different. The plugin doesn't seem to pick up on arcanist being on the path either which could solve this, and with only a global setting this can't work.