Remove some unused functions, constants and variables

This fixes compiler warnings, for example:

    src/ccutil/strngs.cpp:36:11: warning: unused variable 'kMaxDoubleSize' [-Wunused-const-variable]
    src/viewer/svutil.cpp:320:13: warning: unused function 'TessFreeAddrInfo' [-Wunused-function]
    src/ccstruct/werd.cpp:32:19: warning: unused variable 'CANT_SCALE_EDGESTEPS' [-Wunused-const-variable]
    src/textord/bbgrid.cpp:103:10: warning: unused variable 'old_tright' [-Wunused-variable]

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

Author: stweil

src/ccmain/pgedit.cpp

@@ -44,8 +44,6 @@
 #define DESC_HEIGHT     0
 #define MAXSPACING      128      /*max expected spacing in pix */
 
-constexpr ERRCODE EMPTYBLOCKLIST("No blocks to edit");
-
 enum CMD_EVENTS
 {
   NULL_CMD_EVENT,

src/ccstruct/werd.cpp

@@ -29,9 +29,6 @@
 #define LAST_COLOUR ScrollView::AQUAMARINE  ///< last rainbow colour
 #define CHILD_COLOUR ScrollView::BROWN      ///< colour of children
 
-constexpr ERRCODE CANT_SCALE_EDGESTEPS(
-  "Attempted to scale an edgestep format word");
-
 ELIST2IZE(WERD)
 
 /**

src/ccutil/mainblk.cpp

@@ -2,7 +2,6 @@
  * File:        mainblk.cpp  (Formerly main.c)
  * Description: Function to call from main() to setup.
  * Author:      Ray Smith
- * Created:     Tue Oct 22 11:09:40 BST 1991
  *
  * (C) Copyright 1991, Hewlett-Packard Ltd.
  ** Licensed under the Apache License, Version 2.0 (the "License");
@@ -25,10 +24,6 @@
 #include "fileerr.h"
 #include "ccutil.h"
 
-const ERRCODE NO_PATH =
-"Warning:explicit path for executable will not be used for configs";
-static const ERRCODE USAGE = "Usage";
-
 namespace tesseract {
 /**********************************************************************
  * main_setup

src/ccutil/strngs.cpp

@@ -31,9 +31,6 @@ using tesseract::TFile;
 // Size of buffer needed to host the decimal representation of the maximum
 // possible length of an int (in 64 bits), being -<20 digits>.
 const int kMaxIntSize = 22;
-// Size of buffer needed to host the decimal representation of the maximum
-// possible length of a %.8g being -1.2345678e+999<nul> = 16.
-const int kMaxDoubleSize = 16;
 
 /**********************************************************************
  * STRING_HEADER provides metadata about the allocated buffer,

src/textord/bbgrid.cpp

@@ -3,7 +3,6 @@
 // Description: Class to hold BLOBNBOXs in a grid for fast access
 //              to neighbours.
 // Author:      Ray Smith
-// Created:     Wed Jun 06 17:22:01 PDT 2007
 //
 // (C) Copyright 2007, Google Inc.
 // Licensed under the Apache License, Version 2.0 (the "License");
@@ -100,7 +99,7 @@ void IntGrid::Clear() {
 void IntGrid::Rotate(const FCOORD& rotation) {
   ASSERT_HOST(rotation.x() == 0.0f || rotation.y() == 0.0f);
   ICOORD old_bleft(bleft());
-  ICOORD old_tright(tright());
+  //ICOORD old_tright(tright());
   int old_width = gridwidth();
   int old_height = gridheight();
   TBOX box(bleft(), tright());

src/textord/tablefind.cpp

@@ -89,7 +89,7 @@ const double kTableColumnThreshold = 3.0;
 
 // Search for horizontal ruling lines within the vertical margin as a
 // multiple of grid size
-const int kRulingVerticalMargin = 3;
+// const int kRulingVerticalMargin = 3;
 
 // Minimum overlap that a colpartition must have with a table region
 // to become part of that table

src/viewer/svutil.cpp

@@ -315,18 +315,6 @@ static std::string ScrollViewCommand(std::string scrollview_path) {
   return command;
 }
 
-
-// Platform-independent freeaddrinfo()
-static void TessFreeAddrInfo(struct addrinfo* addr_info) {
-  #if defined(__linux__)
-  freeaddrinfo(addr_info);
-  #else
-  delete addr_info->ai_addr;
-  delete addr_info;
-  #endif
-}
-
-
 // Set up a connection to a ScrollView on hostname:port.
 SVNetwork::SVNetwork(const char* hostname, int port) {
   msg_buffer_in_ = new char[kMaxMsgSize + 1];