In Lua 5.1, xpcall() has exactly two arguments: The function to call and
the error handler. Everywhere else, xpcall() passes extra arguments on
to the function to call. This includes LuaJIT, however since LuaJIT sets
_VERSION to "Lua 5.1", so far gears.protected_call used the workaround
for Lua 5.1 here.
This commit switches gears.protected_call to actually test for this
feature instead of just guessing based on _VERSION. Thus, this now also
uses the better code with LuaJIT.
Signed-off-by: Uli Schlachter <psychon@znc.in>
e50fa84f61