d/not-installed: arch independ files

Files not to be installed using  instead of x86_64-linux-gnu
to avoid FTBFS everywhere but amd64
Signed-off-by: Alberto Molina Coballes <alb.molina@gmail.com>

debian/not-installed

-usr/lib/x86_64-linux-gnu/libip4tc.la
-usr/lib/x86_64-linux-gnu/libiptc.la
-usr/lib/x86_64-linux-gnu/libxtables.la
-usr/lib/x86_64-linux-gnu/libip6tc.la
+usr/lib/${DEB_TARGET_MULTIARCH}/libip4tc.la
+usr/lib/${DEB_TARGET_MULTIARCH}/libiptc.la
+usr/lib/${DEB_TARGET_MULTIARCH}/libxtables.la
+usr/lib/${DEB_TARGET_MULTIARCH}/libip6tc.la
 usr/bin/iptables-xml
 usr/share/xtables/pf.os
 etc/ethertypes