luaposix: update to v31
v31 adds more interfaces to POSIX.
New compared to v5.1.11:
nanosleep, open, close, read, write, pipe, dup, dup2, setfl, getfl, fcntl,
poll, fnmatch, memrchr, strptime, statvfs, mkdtemp, isatty, openpt, ptsname,
grantpt, unlockpt, killpg, openpty, realpath, socket functions and constants,
fixes, optimizations, etc.
New dependency: luabitop (provided as a separate patch)
Signed-off-by: Maxim Storchak <m.storchak@gmail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/packages@40673 3c298f89-4303-0410-b956-a3cf2f4a3e73
f24c4210db