procd: use LN macro

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

package/system/procd/Makefile

@@ -110,7 +110,7 @@ define Package/procd-seccomp/install
 	$(INSTALL_DIR) $(1)/sbin $(1)/lib
 	$(INSTALL_DATA) $(PKG_INSTALL_DIR)/usr/lib/libpreload-seccomp.so $(1)/lib
 	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/utrace $(1)/sbin/
-	ln -s utrace $(1)/sbin/seccomp-trace
+	$(LN) utrace $(1)/sbin/seccomp-trace
 	$(INSTALL_DATA) $(PKG_INSTALL_DIR)/usr/lib/libpreload-trace.so $(1)/lib
 endef