[CRIU] [PATCH 2/2] make: Introduce compile time include/config.h generation

[Cyrill Gorcunov]

It's being reported that some systems (as Ubuntu 13.04) already
have struct tcp_repair_opt definition in their system headers.

| sk-tcp.c:25:8: error: redefinition of struct tcp_repair_opt
| sk-tcp.c:31:2: error: redeclaration of enumerator TCP_NO_QUEUE

So add a facility for compile time testing for reported entities
to be present on a system. For this we generate include/config.h
where all tested entries will lay and source code need to include
it only in places where really needed.

Reported-by: Vasily Averin <vvs at parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov at openvz.org>
---
 Makefile                  |  7 +++++--
 Makefile.config           | 15 +++++++++++++++
 scripts/feature-tests.mak | 21 +++++++++++++++++++++
 sk-tcp.c                  |  3 +++
 4 files changed, 44 insertions(+), 2 deletions(-)
 create mode 100644 Makefile.config
 create mode 100644 scripts/feature-tests.mak

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