* include/stdio.h (SEEK_SET, SEEK_CUR, SEEK_END): Define

unconditionally.  Change comment.
	* include/unistd.h (SEEK_SET, SEEK_CUR, SEEK_END): Define
	here too.
	* include/io.h (rename): Declare.
	(remove): Declare.

winsup/mingw/include/unistd.h

@@ -14,10 +14,24 @@
 #include <getopt.h>
 #undef __UNISTD_GETOPT__
 
+/* These are also defined in stdio.h. */
+#ifndef	SEEK_SET
+#define SEEK_SET 0
+#endif
+
+#ifndef	SEEK_CUR
+#define SEEK_CUR 1
+#endif
+
+#ifndef SEEK_END
+#define SEEK_END 2
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+
 /* This is defined as a real library function to allow autoconf
    to verify its existence. */
 int ftruncate(int, off_t);