[cage]
[cage]

RT #50318 : Explicitly cast the argument of toupper in src/debug.c so 
that t/codingstd/check_toxxx.t passes.

Courtesy mike at sprintf dot net



git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@25314 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot