`make` maintenance issues

[cboulay]

The first time I issue make from the brand submodule, everything seems to work great!

If I modify a node's code then run make again, I get a hard crash with a core dump:

make[1]: Leaving directory '/media/chad/STORE/Tools/Neurophys/brandbci/brand-tutorial/brand/lib/hiredis'
ldconfig -C /tmp/cache /media/chad/STORE/Tools/Neurophys/brandbci/brand-tutorial/brand/lib/hiredis
make: *** [Makefile:80: hiredis] Aborted (core dumped)

I have to manually delete the build products from the brand/lib/hiredis folder to be able to run make successfully.

Rather than do the manual delete, I would have preferred to just do make clean, but that yields a different error when it tries to clean calcThreshNorm:

make[1]: Entering directory '/media/chad/STORE/Tools/Neurophys/brandbci/brand-tutorial/brand-modules/cursor-control/nodes/wiener_filter'
rm -f /media/chad/STORE/Tools/Neurophys/brandbci/brand-tutorial/brand/bin/generated/wiener_filter.c wiener_filter.pyx
make[1]: Leaving directory '/media/chad/STORE/Tools/Neurophys/brandbci/brand-tutorial/brand-modules/cursor-control/nodes/wiener_filter'
make -C ../brand-modules/brand-nsp/derivatives/calcThreshNorm clean
make[1]: Entering directory '/media/chad/STORE/Tools/Neurophys/brandbci/brand-tutorial/brand-modules/brand-nsp/derivatives/calcThreshNorm'
make[1]: *** No rule to make target 'clean'.  Stop.
make[1]: Leaving directory '/media/chad/STORE/Tools/Neurophys/brandbci/brand-tutorial/brand-modules/brand-nsp/derivatives/calcThreshNorm'
make: *** [Makefile:105: clean-../brand-modules/brand-nsp/derivatives/calcThreshNorm] Error 2

I haven't yet progressed far enough in my journey into BRAND to know what the derivatives are and why they don't have Make files.