Bison/Flex files: do not load C++ mode under Emacs

It is better to use bison-mode and flex-mode (see the wiki)

DynareBison.yy

@@ -2647,9 +2647,3 @@ Dynare::parser::error(const Dynare::parser::location_type &l,
 {
   driver.error(l, m);
 }
-
-/*
-  Local variables:
-  mode: C++
-  End:
-*/

DynareFlex.ll

@@ -761,9 +761,3 @@ DynareFlexLexer::yylex()
   cerr << "DynareFlexLexer::yylex() has been called, that should never happen!" << endl;
   exit(EXIT_FAILURE);
 }
-
-/*
-  Local variables:
-  mode: C++
-  End:
-*/

macro/MacroBison.yy

@@ -205,9 +205,3 @@ Macro::parser::error(const Macro::parser::location_type &l,
 {
   driver.error(l, m);
 }
-
-/*
-  Local variables:
-  mode: C++
-  End:
-*/

macro/MacroFlex.ll

@@ -427,9 +427,3 @@ MacroFlexLexer::yylex()
   cerr << "MacroFlexLexer::yylex() has been called, that should never happen!" << endl;
   exit(EXIT_FAILURE);
 }
-
-/*
-  Local variables:
-  mode: C++
-  End:
-*/