Fix va_start format passing

src/fstring.cpp

@@ -566,7 +566,7 @@ uInt FString::getUTF8length() const
 }
 
 //----------------------------------------------------------------------
-FString& FString::sprintf (const FString& format, ...)
+FString& FString::sprintf (const FString format, ...)
 {
   static const int BUFSIZE = 4096;
   wchar_t buffer[BUFSIZE];

src/ftermbuffer.cpp

@@ -45,7 +45,7 @@ FTermBuffer::~FTermBuffer()  // destructor
 
 // public methods of FTermBuffer
 //----------------------------------------------------------------------
-int FTermBuffer::writef (const FString& format, ...)
+int FTermBuffer::writef (const FString format, ...)
 {
   static const int BUFSIZE = 4096;
   wchar_t buffer[BUFSIZE];

src/fvterm.cpp

@@ -294,7 +294,7 @@ void FVTerm::delPreprocessingHandler (FVTerm* instance)
 }
 
 //----------------------------------------------------------------------
-int FVTerm::printf (const FString& format, ...)
+int FVTerm::printf (const FString format, ...)
 {
   static const int BUFSIZE = 4096;
   wchar_t buffer[BUFSIZE];

src/include/final/fstring.h

@@ -193,7 +193,7 @@ class FString
     wchar_t  front() const;
     wchar_t  back()  const;
 
-    FString& sprintf (const FString&, ...);
+    FString& sprintf (const FString, ...);
     FString clear();
 
     const wchar_t* wc_str() const;

src/include/final/ftermbuffer.h

@@ -79,7 +79,7 @@ class FTermBuffer
 
     // Methods
     void                   clear();
-    int                    writef (const FString&, ...);
+    int                    writef (const FString, ...);
     int                    write (const FString&);
     int                    write (int);
     FTermBuffer&           write ();

src/include/final/fvterm.h

@@ -235,7 +235,7 @@ class FVTerm : public FTerm
                                                 , FPreprocessingHandler );
     virtual void        delPreprocessingHandler (FVTerm*);
 
-    int                 printf (const FString&, ...);
+    int                 printf (const FString, ...);
     int                 print (const FString&);
     int                 print (term_area*, const FString&);
     int                 print (const std::vector<charData>&);