0032460: Coding Rules - eliminate CLang warning -Wunused-but-set-variable

Code has been adjusted to suppress -Wunused-but-set-variable warnings.

DRAWEXE.wasm, compiler flags have been moved to linker flags
to eliminiate -Wunused-command-line-argument warnings.

src/AdvApp2Var/AdvApp2Var_SysBase.cxx

@@ -928,6 +928,8 @@ int macrmsg_(const char *,//crout,
 /*  READING OF THE LANGUAGE : */
     /* Parameter adjustments */
   ct -= ct_len;
+  (void )ct; // unused
+
   --xt;
   --it;