added stdio.h to includes for DBG compilation

src/interface/pxe/pxe_loader.c

@@ -22,6 +22,7 @@
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <stdio.h>
 #include "pxe.h"
 
 /* PXENV_UNDI_LOADER

src/interface/pxe/pxe_tftp.c

@@ -22,6 +22,7 @@
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <stdio.h>
 #include "pxe.h"
 
 static int pxe_tftp_read_block ( unsigned char *data, unsigned int block,

src/interface/pxe/pxe_udp.c

@@ -4,6 +4,7 @@
  *
  */
 
+#include <stdio.h>
 #include <string.h>
 #include <byteswap.h>
 #include <gpxe/udp.h>

src/interface/pxe/pxe_undi.c

@@ -22,6 +22,7 @@
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <stdio.h>
 #include "pxe.h"
 
 /* PXENV_UNDI_STARTUP