config-base: Beautify header

 - drop empty line
 - end ending endif comment

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
config-base: Add F_SETPIPE_SZ/F_GETPIPE_SZ

These are needed to compile project on CentOS 6.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>