Add new upstream Lua patches and rename all patches for consistency

Add new upstream Lua patches and rename all patches for consistency

Several new upstream patches against the latest version of Lua have
appeared on http://www.lua.org/bugs.html. This commit adds them to
Buildroot, and also renames the other patches to have a coherent patch
naming: lua-bugX, where X is the identifier of the bug as visible on
http://www.lua.org/bugs.html. Note that bug 1 and 2 are not associated
with patches, which explains why the first patch is labeled lua-bug3.

Fixes bug #2365.

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>