[PD-dev] removing files from externals/build/src

[ix]

> .c....sure, 6 thru 10 once we get these figured out, im happy to try again...
>

(try 6)

sickle/Clip.c:17: error: static declaration of 'clip_perform' follows
non-static declaration
../../../pd/src/m_pd.h:586: error: previous declaration of
'clip_perform' was here
distcc[24317] ERROR: compile sickle/Clip.c on localhost failed

fix: not sure. what is the proper way to do the equivalent of the
previous way to skip bad sources: rm src/Clip.c?