Avoid excessive name pollution in test files

Test files are more polite regarding the use of globals when locals
would do, and when globals are necessary deleting them after use.

testes/nextvar.lua

@@ -189,7 +189,7 @@ end
 
 -- size tests for vararg
 lim = 35
-function foo (n, ...)
+local function foo (n, ...)
   local arg = {...}
   check(arg, n, 0)
   assert(select('#', ...) == n)