diff for opening files with O_NOATIME

[Yusuf Goolamabbas]

Linux since 2.6.8 supports O_NOATIME in open(2). This  does not update
 the  file  last  access  time  (st_atime  in the inode) when the file
is read(2). Cherokee <http://www.0x50.org/> does similar things

This might help in static file serving so I cooked up this patch. I
did a grep -r RDONLY in the nginx src and didn't think there were
issues if atime updates were disabled for various cases or should I
create a patch specific to ngx_http_static_module.c

Regards, Yusuf
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