Remove unnecessary code

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit ae2d007edf)

src/gvcore/jpegformattype.cpp

@@ -29,11 +29,7 @@
 // System
 #include <stdio.h>
 #include <setjmp.h>
-extern "C" {
-#define XMD_H
 #include <jpeglib.h>
-#undef const
-}
 
 // TQt
 #include <tqdatetime.h>

src/gvcore/mngformattype.cpp

@@ -85,13 +85,6 @@
 #include "tqasyncimageio.h"
 #include "tqiodevice.h"
 
-// Define XMD_H prohibits the included headers of libmng.h to typedef INT32.
-// This is needed for Borland with STL support, since in that case, INT32 is
-// already defined by some Borland header.
-#define XMD_H
-#if defined(TQ_OS_UNIXWARE)
-#  define HAVE_BOOLEAN  // libjpeg under Unixware seems to need this
-#endif
 #include <libmng.h>
 #include <stdlib.h>
 

src/gvcore/thumbnailloadjob.cpp

@@ -48,10 +48,7 @@
 
 // libjpeg 
 #include <setjmp.h>
-#define XMD_H
-extern "C" {
 #include <jpeglib.h>
-}
 
 // Local
 #include "cache.h"

src/imageutils/jpegerrormanager.h

@@ -21,12 +21,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #define JPEGERRORMANAGER_H
 
 #include <setjmp.h>
-
-extern "C" {
-#define XMD_H
 #include <jpeglib.h>
-#undef const
-}
 
 namespace ImageUtils {