package/dc3dd: fix build with NLS enabled

package/dc3dd: fix build with NLS enabled

Fixes:
    http://autobuild.buildroot.org/results/56e/56eda8289118782de7b8b33f956bfb33b159b86a/
    http://autobuild.buildroot.org/results/b8b/b8b59ab00790ff1b29fb72852e05ef8b402f41ec/
    http://autobuild.buildroot.org/results/ef5/ef581cc3cae46a6ed08c321b575b71e6a384cced/
    [...and a lot more...]

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Benoît Allard <benoit.allard@greenbone.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>