[Lua] Added a patch by Torsten Landschoff to fix the unary minus issue

Ran 'astyle --style=kr -2' across lua.cxx to neaten it up

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@10246 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/lua/operator_overload_runme.lua

@@ -53,8 +53,8 @@ assert(f/g==Op(1))
 --and will complain if too many args are provided
 --therefore disabling these tests for now
 -- (solution will to be not to check args for this test case)
---assert(-a==a)
---assert(-b==Op(-5))
+assert(-a==a)
+assert(-b==Op(-5))
 
 -- test []
 h=Op(3)