Issues with Lua 5.5

[BongoVR]

Hello,

we just ran into some issues after upgrading the Lua library to the recent 5.5 version.

Adjusting sol.hpp was necessary to compile our project again.

Line 2849 (obviously)
#if !defined(LUA_VERSION_NUM) || LUA_VERSION_NUM < 501 || LUA_VERSION_NUM > 505

Line 3729
#if defined(LUA_VERSION_NUM) && (LUA_VERSION_NUM == 504 || LUA_VERSION_NUM == 505)
(LUA_ERRGCMM has still to be defined)

Line 26017
: unique_base(lua_newstate(alfunc, alpointer, luaL_makeseed(nullptr))), state_view(unique_base::get()) {
(lua_newstate got a third parameter; tried to use luaL_makeseed(nullptr))

Otherwise, no issues have been observed so far.
Best regards

[Nerixyz]

See #1723.