Roll back the two previous "@I/O redirect" commits

See the previous commit for the rationale.
diff --git a/lang/builtin/builtin.go b/lang/builtin/builtin.go
index c78a386..5f7c32e 100644
--- a/lang/builtin/builtin.go
+++ b/lang/builtin/builtin.go
@@ -34,6 +34,7 @@
 
 var Statuses = [...]string{
 	// Notes.
+	`"@I/O redirect"`,
 	`"@end of data"`,
 	`"@metadata reported"`,
 
diff --git a/release/c/wuffs-unsupported-snapshot.c b/release/c/wuffs-unsupported-snapshot.c
index 13153a5..3065fab 100644
--- a/release/c/wuffs-unsupported-snapshot.c
+++ b/release/c/wuffs-unsupported-snapshot.c
@@ -189,6 +189,7 @@
 
 } wuffs_base__status;
 
+extern const char* wuffs_base__note__i_o_redirect;
 extern const char* wuffs_base__note__end_of_data;
 extern const char* wuffs_base__note__metadata_reported;
 extern const char* wuffs_base__suspension__even_more_information;
@@ -7966,6 +7967,7 @@
     0x08, 0x0A, 0x0C, 0x10, 0x18, 0x20, 0x30, 0x40,
 };
 
+const char* wuffs_base__note__i_o_redirect = "@base: I/O redirect";
 const char* wuffs_base__note__end_of_data = "@base: end of data";
 const char* wuffs_base__note__metadata_reported = "@base: metadata reported";
 const char* wuffs_base__suspension__even_more_information =
@@ -12249,7 +12251,7 @@
       status = wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
       goto exit;
     } else if (self->private_impl.f_io_redirect_fourcc != 0) {
-      status = wuffs_base__make_status(wuffs_base__note__metadata_reported);
+      status = wuffs_base__make_status(wuffs_base__note__i_o_redirect);
       goto ok;
     }
     {
@@ -12555,11 +12557,11 @@
     if (v_bits_per_pixel == 0) {
       if (v_compression == 4) {
         self->private_impl.f_io_redirect_fourcc = 1246774599;
-        status = wuffs_base__make_status(wuffs_base__note__metadata_reported);
+        status = wuffs_base__make_status(wuffs_base__note__i_o_redirect);
         goto ok;
       } else if (v_compression == 5) {
         self->private_impl.f_io_redirect_fourcc = 1347307296;
-        status = wuffs_base__make_status(wuffs_base__note__metadata_reported);
+        status = wuffs_base__make_status(wuffs_base__note__i_o_redirect);
         goto ok;
       }
       status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
diff --git a/std/bmp/decode_bmp.wuffs b/std/bmp/decode_bmp.wuffs
index 1299685..28311da 100644
--- a/std/bmp/decode_bmp.wuffs
+++ b/std/bmp/decode_bmp.wuffs
@@ -72,7 +72,7 @@
 	if (this.call_sequence <> 0) or (this.io_redirect_fourcc == 1) {
 		return base."#bad call sequence"
 	} else if this.io_redirect_fourcc <> 0 {
-		return base."@metadata reported"  // XXX
+		return base."@I/O redirect"
 	}
 
 	// Read the BITMAPFILEHEADER (14 bytes).
@@ -130,10 +130,10 @@
 	if bits_per_pixel == 0 {
 		if compression == 4 {
 			this.io_redirect_fourcc = 'JPEG'be
-			return base."@metadata reported"  // XXX
+			return base."@I/O redirect"
 		} else if compression == 5 {
 			this.io_redirect_fourcc = 'PNG 'be
-			return base."@metadata reported"  // XXX
+			return base."@I/O redirect"
 		}
 		return "#unsupported BMP file"
 	} else if bits_per_pixel == 24 {
diff --git a/test/c/std/bmp.c b/test/c/std/bmp.c
index 5679347..1e20e2f 100644
--- a/test/c/std/bmp.c
+++ b/test/c/std/bmp.c
@@ -131,9 +131,9 @@
 
   wuffs_base__status status =
       wuffs_bmp__decoder__decode_image_config(&dec, NULL, &src);
-  if (status.repr != wuffs_base__note__metadata_reported) {  // XXX
+  if (status.repr != wuffs_base__note__i_o_redirect) {
     RETURN_FAIL("decode_image_config: have \"%s\", want \"%s\"", status.repr,
-                wuffs_base__note__metadata_reported);  // XXX
+                wuffs_base__note__i_o_redirect);
   }
 
   wuffs_base__io_buffer empty = wuffs_base__empty_io_buffer();