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When building on x86_64 hosts, the configure script will try to add /lib64 from the host to the linker command, which will usually result in failing the ncurses library test, fix this by checking whether we are cross-compiling or not. Signed-off-by: Florian Fainelli <florian@openwrt.org> git-svn-id: svn://svn.openwrt.org/openwrt/packages@39802 3c298f89-4303-0410-b956-a3cf2f4a3e73