package/dvb-apps: fix build with some perl version

perl can't find a module that is located in the current directory,
so help it locate it.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
(cherry picked from commit d8234d440024719e4df61f583b26302162dc363f)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/dvb-apps/dvb-apps.mk

@@ -15,6 +15,8 @@ DVB_APPS_DEPENDENCIES = libiconv
 DVB_APPS_LDLIBS += -liconv
 endif
 
+DVB_APPS_MAKE_OPTS = PERL5LIB=$(@D)/util/scan
+
 ifeq ($(BR2_STATIC_LIBS),y)
 DVB_APPS_MAKE_OPTS += enable_shared=no
 else ifeq ($(BR2_SHARED_LIBS),y)