kbuild: genksyms: Include extern information in dumps

The extern flag currently is not included in type dump files
(genksyms --dump-types). Include that flag there for completeness.

Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/scripts/genksyms/genksyms.c b/scripts/genksyms/genksyms.c
index 4f8a300..c249274 100644
--- a/scripts/genksyms/genksyms.c
+++ b/scripts/genksyms/genksyms.c
@@ -545,6 +545,8 @@
 			}
 			fputs(sym->name, dumpfile);
 			putc(' ', dumpfile);
+			if (sym->is_extern)
+				fputs("extern ", dumpfile);
 			print_list(dumpfile, sym->defn);
 			putc('\n', dumpfile);