Added support for lua to scons.

SConstruct

@@ -219,6 +219,7 @@ if env["prereqs"]:
     have_client_prereqs = have_server_prereqs and \
         conf.CheckPango("cairo") and \
         conf.CheckPKG("fontconfig") and \
+        (conf.CheckPKG("lua '>=' 5.1") or conf.CheckPKG("lua5.1 '>=' 5.1")) and \
         conf.CheckBoost("regex") and \
         conf.CheckSDL("SDL_ttf", require_version = "2.0.8") and \
         conf.CheckSDL("SDL_mixer", require_version = '1.2.0') and \

src/SConscript

@@ -189,6 +189,7 @@ wesnoth_sources = Split("""
     portrait.cpp
     replay.cpp
     replay_controller.cpp
+    scripting/lua.cpp
     sha1.cpp
     settings.cpp
     statistics.cpp