Add missing order-only prereq for unifdef
Add missing order-only prereq for unifdef

For O= make sure that top_builddir/extra/scripts is created
before trying to build unifdef into it.

Signed-off-by: Bernhard Reutner-Fischer <ce1ac9e9ad16abccd7821f371ad381197b4768ac@gmail.com>

joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc