Split error-message table portions of errno.h out to gpxe/errortab.h

src/core/errno.c

-#include "etherboot.h"
-#include "errno.h"
-#include "vsprintf.h"
+#include <errno.h>
+#include <console.h>
+#include <gpxe/errortab.h>
 
 /** @file
  *

src/include/errno.h

 #define ETIMEDOUT	0xf6	/**< Connection timed out */
 #define EWOULDBLOCK	EAGAIN	/**< Resource temporarily unavailable */
 
-/* Data structures and declarations */
-
-#include <gpxe/tables.h>
-
 extern int errno;
 
-struct errortab {
-	int errno;
-	const char *text;
-};
-
-#define __errortab __table(errortab,01)
-
 #endif /* ERRNO_H */

src/include/gpxe/errortab.h

+#ifndef _GPXE_ERRORTAB_H
+#define _GPXE_ERRORTAB_H
+
+/** @file
+ *
+ * Error message tables
+ *
+ */
+
+#include <errno.h>
+#include <gpxe/tables.h>
+
+struct errortab {
+	int errno;
+	const char *text;
+};
+
+#define __errortab __table ( errortab, 01 )
+
+#endif /* _GPXE_ERRORTAB_H */

src/interface/pxe/pxe_errors.c

-#include "errno.h"
+#include <gpxe/errortab.h>
 
 /*
  * This table was generated from the relevant section of errno.h using