[ANN] Update to sig_catch power patch

[Reuben Thomas <rrt@...>]

Thanks to the Lua team for pointing out a (very) long-standing bug in my sig_catch patch. I have updated all versions of it (back to Lua 5.1).

The bug was that it prevented Ctrl+C from interrupting computation. The fix was simply to remove part of the patch, so the new version is actually simpler and shorter.

See: http://lua-users.org/wiki/LuaPowerPatches

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