outbin: register the mapfile; check for input clobber; remove on fail

- Register the map file with the filename system.
- Check to see if the mapfile is clobbering the input.
- Remove the map file if the output file is also removed.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>

include/files.h

@@ -19,6 +19,7 @@ enum filenames {
     FN_ERRFILE,                 /* Error message file */
     FN_LISTFILE,                /* Listing file */
     FN_DEPENDFILE,              /* Dependency file */
+    FN_MAPFILE,                 /* Map file (outbin) */
     FN_NFILES
 };