script: new applet by Pascal Bellard <pascal.bellard AT ads-lu.com>

diff --git a/libbb/Kbuild b/libbb/Kbuild
index aab016e..fc87f62 100644
--- a/libbb/Kbuild
+++ b/libbb/Kbuild
@@ -39,6 +39,7 @@
 lib-y += get_last_path_component.o
 lib-y += get_line_from_file.o
 lib-y += getopt32.o
+lib-y += getpty.o
 lib-y += herror_msg.o
 lib-y += herror_msg_and_die.o
 lib-y += human_readable.o