perl: fix build on big endian arch

see http://autobuild.buildroot.org/results/3a1/3a1c2f0bc802d3cec26ffd4ded8f5c04473a3d4b/build-end.log

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/perl/perl.mk

@@ -58,6 +58,7 @@ PERL_CONF_OPTS = \
 	-Dld="$(TARGET_CC_NOCCACHE)" \
 	-Dccflags="$(TARGET_CFLAGS)" \
 	-Dldflags="$(TARGET_LDFLAGS) -lm" \
+	-Dmultiarch \
 	-Dmydomain="" \
 	-Dmyhostname="$(BR2_TARGET_GENERIC_HOSTNAME)" \
 	-Dmyuname="Buildroot $(BR2_VERSION_FULL)" \