Add basic errno support.

Needed for hash table support; probably useful in a lot of other
places as well.

Signed-off-by: Wolfgang Denk <wd@denx.de>

include/errno.h

+#ifndef _ERRNO_H
+
+#include <asm-generic/errno.h>
+
+extern int errno;
+
+#define __set_errno(val) do { errno = val; } while (0)
+
+#endif /* _ERRNO_H */

lib/Makefile

@@ -37,6 +37,7 @@ COBJS-y += crc32.o
 COBJS-y += ctype.o
 COBJS-y += display_options.o
 COBJS-y += div64.o
+COBJS-y += errno.o
 COBJS-$(CONFIG_GZIP) += gunzip.o
 COBJS-$(CONFIG_LMB) += lmb.o
 COBJS-y += ldiv.o

lib/errno.c

+int errno = 0;