When compiling bmon with the Linaro 2014.01 ARM toolchain
(gcc-linaro-arm-linux-gnueabihf-4.8-2014.01_linux) the following compile error occurs:
in_netlink.c: In function ‘do_link’:
in_netlink.c:688:53: error: ‘IFF_UP’ undeclared (first use in this function)
Fix it by explicitly including linux/if.h, where IFF_UP is defined.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
