Beat Küng d300a879f1 cmake: remove romfs content before tar extraction
This avoids incremental build errors when switching between branches with
a different set of airframes.

E.g:
Aborting due to missing @type tag in file: 'Firmware/build/px4_fmu-v5_default/etc/init.d/airframes/13030_generic_vtol_quad_tiltrotor'
2021-05-11 13:14:42 -04:00
..