Support for Lua added - patch from Mark Gossage

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@7365 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/lua/ret_by_value_runme.lua

@@ -0,0 +1,9 @@
+require("import")	-- the import fn
+import("ret_by_value")	-- import code
+
+-- catch "undefined" global variables
+setmetatable(getfenv(),{__index=function (t,i) error("undefined global variable `"..i.."'",2) end})
+
+a = ret_by_value.get_test()
+assert(a.myInt == 100)
+assert(a.myShort == 200)