Close some file descriptors on exec so that the inferior process gets

a normal environment.  Fd's 3 and 4 were usually left open.

contrib/gdb/gdb/exec.c

@@ -185,6 +185,7 @@ exec_file_command (args, from_tty)
 			    &scratch_pathname);
       if (scratch_chan < 0)
 	perror_with_name (filename);
+      fcntl (scratch_chan, F_SETFD, 1);
       exec_bfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
 
       if (!exec_bfd)

contrib/gdb/gdb/symfile.c

@@ -820,6 +820,7 @@ symfile_bfd_open (name)
       make_cleanup (free, name);
       perror_with_name (name);
     }
+  fcntl (desc, F_SETFD, 1);
   free (name);			/* Free 1st new malloc'd copy */
   name = absolute_name;		/* Keep 2nd malloc'd copy in bfd */
 				/* It'll be freed in free_objfile(). */