buildbot reported error on platforms with VFP (sunxi,imx6,omap): NPtcp uses VFP register arguments, /tmp/.o does not CFLAGS were overwritten so append them instead Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de> Signed-off-by: Florian Fainelli <florian@openwrt.org> SVN-Revision: 40790