Use gnu_printf for Windows build

Signed-off-by: Stefan Weil <sw@weilnetz.de>

src/ccutil/errcode.h

@@ -42,7 +42,7 @@ class TESS_API ERRCODE { // error handler class
       const char *caller,      // function location
       TessErrorLogCode action, // action to take
       const char *format, ...  // fprintf format
-  ) const __attribute__((format(printf, 4, 5)));
+  ) const __attribute__((format(gnu_printf, 4, 5)));
   void error(const char *caller, TessErrorLogCode action) const;
   constexpr ERRCODE(const char *string) : message(string) {} // initialize with string
 };

src/ccutil/tprintf.h

@@ -34,7 +34,7 @@ extern TESS_API INT_VAR_H(log_level);
 // Main logging function.
 extern TESS_API void tprintf( // Trace printf
     const char *format, ...)  // Message
-    __attribute__((format(printf, 1, 2)));
+    __attribute__((format(gnu_printf, 1, 2)));
 
 } // namespace tesseract
 

src/viewer/scrollview.h

@@ -298,7 +298,7 @@ class TESS_API ScrollView {
   // ...which can be added by this command.
   // This is intended as an "debug" output window.
   void AddMessage(const char *message);
-  void AddMessageF(const char *format, ...) __attribute__((format(printf, 2, 3)));
+  void AddMessageF(const char *format, ...) __attribute__((format(gnu_printf, 2, 3)));
 
   // Zoom the window to the rectangle given upper left corner and
   // lower right corner.
@@ -311,7 +311,7 @@ class TESS_API ScrollView {
   // this just for fun will likely break your application!
   // It is public so you can actually take use of the LUA functionalities, but
   // be careful!
-  void SendMsg(const char* msg, ...) __attribute__((format(printf, 2, 3)));
+  void SendMsg(const char* msg, ...) __attribute__((format(gnu_printf, 2, 3)));
 
   // Custom messages (manipulating java code directly) can be send through this.
   // Send a message to the server without adding the