Backport PUC Lua 5.4's string.{pack,unpack,packsize}

src/CMakeLists.txt

@@ -699,6 +699,7 @@ if(BUILD_CLIENT)
 		${GMP_LIBRARY}
 		${JSON_LIBRARY}
 		${LUA_BIT_LIBRARY}
+		lstrpack
 		sha256
 		${FREETYPE_LIBRARY}
 		${PLATFORM_LIBS}
@@ -789,6 +790,7 @@ if(BUILD_SERVER)
 		${JSON_LIBRARY}
 		${LUA_LIBRARY}
 		${LUA_BIT_LIBRARY}
+		lstrpack
 		sha256
 		${GMP_LIBRARY}
 		${PLATFORM_LIBS}

src/script/cpp_api/s_base.cpp

@@ -27,6 +27,7 @@ extern "C" {
 #else
 	#include "bit.h"
 #endif
+#include "lstrpack.h"
 }
 
 #include "script/common/c_content.h"
@@ -80,6 +81,9 @@ ScriptApiBase::ScriptApiBase(ScriptingType type):
 	lua_pushstring(m_luastack, LUA_BITLIBNAME);
 	lua_call(m_luastack, 1, 0);
 
+	// Load string.{pack,unpack,packsize}
+	setup_lstrpack(m_luastack);
+
 #if BUILD_WITH_TRACY
 	// Load tracy lua bindings
 	tracy::LuaRegister(m_luastack);