fix: Compile Lua as a C library (#5251)

src/controllers/plugins/LuaAPI.cpp

@@ -9,9 +9,11 @@
 #    include "messages/MessageBuilder.hpp"
 #    include "providers/twitch/TwitchIrcServer.hpp"
 
+extern "C" {
 #    include <lauxlib.h>
 #    include <lua.h>
 #    include <lualib.h>
+}
 #    include <QFileInfo>
 #    include <QLoggingCategory>
 #    include <QTextCodec>

src/controllers/plugins/LuaAPI.hpp

@@ -2,7 +2,9 @@
 
 #ifdef CHATTERINO_HAVE_PLUGINS
 
+extern "C" {
 #    include <lua.h>
+}
 #    include <QString>
 
 #    include <cassert>

src/controllers/plugins/LuaUtilities.cpp

@@ -7,8 +7,10 @@
 #    include "controllers/plugins/api/ChannelRef.hpp"
 #    include "controllers/plugins/LuaAPI.hpp"
 
+extern "C" {
 #    include <lauxlib.h>
 #    include <lua.h>
+}
 
 #    include <climits>
 #    include <cstdlib>

src/controllers/plugins/LuaUtilities.hpp

@@ -4,8 +4,10 @@
 
 #    include "common/QLogging.hpp"
 
+extern "C" {
 #    include <lua.h>
 #    include <lualib.h>
+}
 #    include <magic_enum/magic_enum.hpp>
 #    include <QList>
 

src/controllers/plugins/Plugin.cpp

@@ -4,7 +4,9 @@
 #    include "common/QLogging.hpp"
 #    include "controllers/commands/CommandController.hpp"
 
+extern "C" {
 #    include <lua.h>
+}
 #    include <magic_enum/magic_enum.hpp>
 #    include <QJsonArray>
 #    include <QJsonObject>

src/controllers/plugins/PluginController.cpp

@@ -14,9 +14,11 @@
 #    include "singletons/Paths.hpp"
 #    include "singletons/Settings.hpp"
 
+extern "C" {
 #    include <lauxlib.h>
 #    include <lua.h>
 #    include <lualib.h>
+}
 #    include <QJsonDocument>
 
 #    include <memory>

src/controllers/plugins/api/ChannelRef.cpp

@@ -9,8 +9,10 @@
 #    include "providers/twitch/TwitchChannel.hpp"
 #    include "providers/twitch/TwitchIrcServer.hpp"
 
+extern "C" {
 #    include <lauxlib.h>
 #    include <lua.h>
+}
 
 #    include <cassert>
 #    include <memory>

src/controllers/plugins/api/IOWrapper.cpp

@@ -4,8 +4,11 @@
 #    include "Application.hpp"
 #    include "controllers/plugins/LuaUtilities.hpp"
 #    include "controllers/plugins/PluginController.hpp"
-#    include "lauxlib.h"
-#    include "lua.h"
+
+extern "C" {
+#    include <lauxlib.h>
+#    include <lua.h>
+}
 
 #    include <cerrno>