sendmail: update by Vladimir

build system: tweak for rare case where include/autoconf.h
  does not get updated

function                                             old     new   delta
packed_usage                                       26238   26242      +4
sendmail_main                                       1353     897    -456
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 4/-456)           Total: -452 bytes

1 files changed, 7 insertions, 1 deletions

diff --git a/scripts/kconfig/util.c b/scripts/kconfig/util.c
index aea8d56ce..0461a5f40 100644
--- a/scripts/kconfig/util.c
+++ b/scripts/kconfig/util.c
@@ -44,7 +44,13 @@ int file_write_dep(const char *name)
                 else
                         fprintf(out, "\t%s\n", file->name);
         }
-        fprintf(out, "\n.config include/autoconf.h: $(deps_config)\n\n$(deps_config):\n");
+        fprintf(out,
+                "\n"
+                ".config include/autoconf.h: $(deps_config)\n"
+                "\n"
+                "include/autoconf.h: .config\n" /* bbox */
+                "\n"
+                "$(deps_config):\n");
         fclose(out);
         rename("..config.tmp", name);
         return 0;