Fixed RtlCompareString and RtlCompareStringN, they were very wrong, for CompareString the params are struct ptrs not char ptrs

Fixed a ton of clang-cl compiler warnings about unused variables, still many left. Fixed a lot of inconsistent override ones too

src/xenia/cpu/compiler/passes/conditional_group_pass.cc

@@ -48,7 +48,6 @@ bool ConditionalGroupPass::Initialize(Compiler* compiler) {
 
 bool ConditionalGroupPass::Run(HIRBuilder* builder) {
   bool dirty;
-  int loops = 0;
   do {
     assert_true(loops < 20);  // arbitrary number
     dirty = false;
@@ -68,7 +67,6 @@ bool ConditionalGroupPass::Run(HIRBuilder* builder) {
         dirty |= result;
       }
     }
-    loops++;
   } while (dirty);
   return true;
 }