Remove old Lua 5.0 compatibility defines.
Remove old Lua 5.0 compatibility defines.

Suggested by François Perrad.

eugeneia/snabb,alexandergall/snabbswitch,snabbco/snabb,Igalia/snabbswitch,Igalia/snabb,alexandergall/snabbswitch,Igalia/snabb,eugeneia/snabb,Igalia/snabbswitch,alexandergall/snabbswitch,eugeneia/snabb,SnabbCo/snabbswitch,Igalia/snabb,SnabbCo/snabbswitch,snabbco/snabb,eugeneia/snabb,eugeneia/snabb,alexandergall/snabbswitch,snabbco/snabb,Igalia/snabb,SnabbCo/snabbswitch,eugeneia/snabb,snabbco/snabb,snabbco/snabb,alexandergall/snabbswitch,Igalia/snabb,alexandergall/snabbswitch,eugeneia/snabb,eugeneia/snabb,snabbco/snabb,alexandergall/snabbswitch,snabbco/snabb,snabbco/snabb,Igalia/snabb,SnabbCo/snabbswitch,Igalia/snabbswitch,Igalia/snabbswitch,Igalia/snabb,Igalia/snabbswitch,alexandergall/snabbswitch,Igalia/snabb