Move deletion of defs.conf, because this was causing distclean to fail before nuking stale depend files.
Move deletion of defs.conf, because this was causing distclean to fail before nuking stale depend files.

RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix