Improved iproute2 to build and install a shared libnetlink if possible

network/iproute2/iproute2.conf

@@ -47,4 +47,8 @@ pkginstalled bdb33 && atstage native || \
 # FIXME: disabling tc and genl is not the best way of not needed -ldl
 if [ "$SDECFG_STATIC" == 1 ]; then
 	var_append patchfiles ' ' $confdir/nodynamic.diff
+else
+	# build and install libnetlink.so
+	var_append makeopt ' ' "SHARED=1"
+	var_append makeinstopt ' ' "SHARED=1"
 fi