BaseTools: correct mal-typed CVfrDLGLexer::errstd

The member function CVfrDLGLexer::errstd is intended as an override virtual
function of DLGLexerBase::errstd, but due to mismatched prototype, it
didn't override, and never got called.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Zenith432 <zenith432@users.sourceforge.net>
Reviewed-by: Liming Gao <liming.gao@intel.com>
(cherry picked from commit 8b13e18143)

BaseTools/Source/C/VfrCompile/VfrSyntax.g

@@ -42,7 +42,7 @@ class CVfrDLGLexer : public VfrLexer
 {
 public:
   CVfrDLGLexer (DLGFileInput *F) : VfrLexer (F) {};
-  INT32 errstd (char *Text)
+  void errstd (const char *Text)
   {
     printf ("unrecognized input '%s'\n", Text);
   }