Enable bit32 library

Deprecated in Lua 5.3, but still contains some useful things, like extract()

Also helps maintain backward-compatibility with scripts that target older DF
versions (e.g. Mifki's dfremote project)

depends/lua/CMakeLists.txt

@@ -3,6 +3,9 @@ CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
 
 SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -DLUA_USE_APICHECK")
 
+# Make bit32 library available (for things like bit32.extract())
+ADD_DEFINITIONS(-DLUA_COMPAT_BITLIB)
+
 IF(WIN32)
     ADD_DEFINITIONS(-D_CRT_SECURE_NO_DEPRECATE )
 ELSE()