[muparser] Remove the optimizer

The optimizer adds a fair amount of complexity in muparser with no
benefit to fish, since fish is not going to use complicated expressions
or cache parsed expressions.

muparser-2.2.5/include/muParserBase.h

@@ -109,7 +109,6 @@ class ParserBase {
     void SetThousandsSep(char_type cThousandsSep = 0);
     void ResetLocale();
 
-    void EnableOptimizer(bool a_bIsOn = true);
     void EnableBuiltInOprt(bool a_bIsOn = true);
 
     bool HasBuiltInOprt() const;

muparser-2.2.5/include/muParserBytecode.h

@@ -95,8 +95,6 @@ class ParserByteCode {
     /** \brief The actual rpn storage. */
     rpn_type m_vRPN;
 
-    bool m_bEnableOptimizer;
-
     void ConstantFolding(ECmdCode a_Oprt);
 
    public:
@@ -113,8 +111,6 @@ class ParserByteCode {
     void AddFun(generic_fun_type a_pFun, int a_iArgc);
     void AddStrFun(generic_fun_type a_pFun, int a_iArgc, int a_iIdx);
 
-    void EnableOptimizer(bool bStat);
-
     void Finalize();
     void clear();
     std::size_t GetMaxStackSize() const;