Define two symbols needed in both kernel and user space.

Remove old (somewhat incorrect) variant that wasn't used in many cases.
Default applies to both RMSS and SMSS.

Replace numeric constants with defined symbols.

Signed-off-by: William.Allen.Simpson@gmail.com
---
  include/linux/tcp.h      |    6 ++++++
  include/net/tcp.h        |    3 ---
  net/ipv4/tcp_input.c     |    4 ++--
  net/ipv4/tcp_ipv4.c      |    6 +++---
  net/ipv4/tcp_minisocks.c |    2 +-
  net/ipv6/tcp_ipv6.c      |    2 +-
  6 files changed, 13 insertions(+), 10 deletions(-)