package/iptables: fix compile failure on gentoo build system (thanks nbd)

SVN-Revision: 21996

package/iptables/Makefile

@@ -289,6 +289,7 @@ IPTABLES_MAKEOPTS = \
 
 define Build/Compile
 	$(INSTALL_DIR) $(PKG_INSTALL_DIR)
+	(cd $(PKG_BUILD_DIR); ./autogen.sh)
 	$(MAKE) -C $(PKG_BUILD_DIR) $(IPTABLES_MAKEOPTS)
 	$(MAKE) -C $(PKG_BUILD_DIR) $(IPTABLES_MAKEOPTS) install
 	$(MAKE) -C $(PKG_BUILD_DIR)/libipq $(IPTABLES_MAKEOPTS)