Re: [PATCH v1] ell/rtnl: fix compile with older toolchains

Older toolchains need to include sys/types.h and sys/socket.h before linux/if.h, RTA_PREF was introduces with linux-4.1.x. Fixes: In file included from ell/rtnl.c:28:0: .../host/arm-buildroot-linux-gnueabi/sysroot/usr/include/linux/if.h:185:19: error: field 'ifru_addr' has incomplete type .../host/arm-buildroot-linux-gnueabi/sysroot/usr/include/linux/if.h:186:19: error: field 'ifru_dstaddr' has incomplete type .../host/arm-buildroot-linux-gnueabi/sysroot/usr/include/linux/if.h:187:19: error: field 'ifru_broadaddr' has incomplete type .../host/arm-buildroot-linux-gnueabi/sysroot/usr/include/linux/if.h:188:19: error: field 'ifru_netmask' has incomplete type .../arm-buildroot-linux-gnueabi/sysroot/usr/include/linux/if.h:189:20: error: field 'ifru_hwaddr' has incomplete type ell/rtnl.c: In function 'l_rtnl_route_extract': ell/rtnl.c:120:8: error: 'RTA_PREF' undeclared (first use in this function)