nettle: disable parallel make
nettle: disable parallel make

to avoid
| /bin/sh: line 1: ./desdata: Text file busy
| Makefile:262: recipe for target 'rotors.h' failed

Signed-off-by: Toshiko YOSHIDA <311de952d79aff7d5c68e1437a41a732e1c05c82@toshiba.co.jp>

tienlee/meta-debian,nghiaht-tsdv/meta-debian,nghiaht-tsdv/meta-debian,nghiaht-tsdv/meta-debian,tienlee/meta-debian,tienlee/meta-debian,nghiaht-tsdv/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,nghiaht-tsdv/meta-debian,nghiaht-tsdv/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,tienlee/meta-debian