Update history of SHAPELIB copy:

* files shpopen.c,shapefil.h,dbfopen.c:
   from ogr/ogrsf_frmts/shape/
* file safileio.c
   from SHAPELIB itself (http://download.osgeo.org/shapelib/)

Last update
* taken from GDAL 2.1.2 and SHAPELIB 1.3.0 (Thu Nov 24 10:45:41 CET 2016)
* taken from GDAL 1.5.1-SVN (Sun Mar 30 11:20:43 CEST 2008)
* taken from GDAL 1.5.0-CVS (Wed Sep  5 13:48:48 CEST 2007)
* taken from GDAL 1.3.2-CVS (Sat Jun 17 22:08:04 CEST 2006)

Additional fixes:
* dbfopen.c
   around line 1270: GDAL bug #809 (http://trac.osgeo.org/gdal/ticket/809)
   remove CPLsnprintf
   remove CPL_IGNORE_RET_VAL_INT
   for WIN32, define snprintf as in shpopen.c

* shpopen.c
  define CPL_UNUSED

* safileio.c
  SHP_CVSID: ISO C does not allow extra ‘;’ outside of a function

* Use <grass/shapefil.h> etc rather than "shapefil.h"
   in shpopen.c, dbfopen.c, and safileio.c


full fix for dbf_open.c
-->
diff -up shapelib_gdal/dbfopen.c shapelib/dbfopen.c 
--- shapelib_gdal/dbfopen.c	2016-10-24 13:00:32.000000000 +0200
+++ shapelib/dbfopen.c	2016-11-24 11:34:23.996675393 +0100
@@ -157,7 +157,7 @@
  * Treat all blank numeric fields as null too.
  */
 
-#include "shapefil.h"
+#include <grass/shapefil.h>
 
 #include <math.h>
 #include <stdlib.h>
@@ -170,6 +170,12 @@
 #define CPLsprintf sprintf
 #endif
 
+#if defined(WIN32) || defined(_WIN32)
+#  ifndef snprintf
+#     define snprintf _snprintf
+#  endif
+#endif
+
 SHP_CVSID("$Id$")
 
 #ifndef FALSE
@@ -177,8 +183,6 @@ SHP_CVSID("$Id: dbfopen.c,v 1.89 2011-07
 #  define TRUE		1
 #endif
 
-CPL_INLINE static void CPL_IGNORE_RET_VAL_INT(CPL_UNUSED int unused) {}
-
 /************************************************************************/
 /*                             SfRealloc()                              */
 /*                                                                      */
@@ -616,7 +620,7 @@ DBFClose(DBFHandle psDBF)
     if( psDBF->bNoHeader )
         DBFWriteHeader( psDBF );
 
-    CPL_IGNORE_RET_VAL_INT(DBFFlushRecord( psDBF ));
+    DBFFlushRecord( psDBF );
 
 /* -------------------------------------------------------------------- */
 /*      Update last access date, and number of records if we have	*/
@@ -1273,8 +1277,8 @@ DBFGetFieldInfo( DBFHandle psDBF, int iF
     else if( psDBF->pachFieldType[iField] == 'N'
              || psDBF->pachFieldType[iField] == 'F' )
     {
-	if( psDBF->panFieldDecimals[iField] > 0
-            || psDBF->panFieldSize[iField] >= 10 )
+	if( psDBF->panFieldDecimals[iField] > 0 )
+/*            || psDBF->panFieldSize[iField] >= 10 ) */ /* GDAL bug #809 */
 	    return( FTDouble );
 	else
 	    return( FTInteger );
@@ -1364,7 +1368,7 @@ static int DBFWriteAttribute(DBFHandle p
 
         snprintf( szFormat, sizeof(szFormat), "%%%d.%df",
                     nWidth, psDBF->panFieldDecimals[iField] );
-        CPLsnprintf(szSField, sizeof(szSField), szFormat, *((double *) pValue) );
+        snprintf(szSField, sizeof(szSField), szFormat, *((double *) pValue) );
         if( (int) strlen(szSField) > psDBF->panFieldSize[iField] )
         {
             szSField[psDBF->panFieldSize[iField]] = '\0';
<--

full fix for shpopen.c
-->
diff -up shapelib_gdal/shpopen.c shapelib/shpopen.c 
--- shapelib_gdal/shpopen.c	2016-10-24 13:00:32.000000000 +0200
+++ shapelib/shpopen.c	2016-11-24 10:25:58.460964573 +0100
@@ -265,7 +265,7 @@
  *
  */
 
-#include "shapefil.h"
+#include <grass/shapefil.h>
 
 #include <math.h>
 #include <limits.h>
@@ -276,6 +276,10 @@
 
 SHP_CVSID("$Id$")
 
+#ifndef CPL_UNUSED
+#define CPL_UNUSED
+#endif
+
 typedef unsigned char uchar;
 
 #if UINT_MAX == 65535
<--

full fix for safileio.c
-->
diff -up shapelib_gdal/safileio.c shapelib/safileio.c 
--- shapelib_gdal/safileio.c	2008-01-16 21:05:14.000000000 +0100
+++ shapelib/safileio.c	2016-11-24 10:25:42.734991066 +0100
@@ -56,7 +56,7 @@
  *
  */
 
-#include "shapefil.h"
+#include <grass/shapefil.h>
 
 #include <math.h>
 #include <limits.h>
@@ -65,7 +65,7 @@
 #include <string.h>
 #include <stdio.h>
 
-SHP_CVSID("$Id$");
+SHP_CVSID("$Id$")
 
 #ifdef SHPAPI_UTF8_HOOKS
 #   ifdef SHPAPI_WINDOWS
<--