Allow setting FD_CLOEXEC flag for new sockets

Allow setting FD_CLOEXEC flag for new sockets

This is a first user of sys_indirect.  Several of the socket-related system
calls which produce a file handle now can be passed an additional parameter
to set the FD_CLOEXEC flag.

 include/asm-x86/ia32_unistd.h |    1 +
 include/linux/indirect.h      |   27 +++++++++++++++++++++++++++
 net/socket.c                  |   21 +++++++++++++--------
 3 files changed, 41 insertions(+), 8 deletions(-)

Signed-off-by: Jens Axboe <axboe@axboetest.dk.oracle.com>