Network Drop Monitor: Adding Build changes to enable drop monitor

Network Drop Monitor: Adding Build changes to enable drop monitor

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>

 include/linux/Kbuild |    1 +
 net/Kconfig          |   11 +++++++++++
 net/core/Makefile    |    1 +
 3 files changed, 13 insertions(+)
Signed-off-by: David S. Miller <davem@davemloft.net>