chpasswd: new applet by Alexander Shishkin <virtuoso@slind.org>

diff --git a/libbb/Kbuild b/libbb/Kbuild
index 6595867..c0cbe1a 100644
--- a/libbb/Kbuild
+++ b/libbb/Kbuild
@@ -104,7 +104,8 @@
 lib-$(CONFIG_FEATURE_MOUNT_LOOP) += loop.o
 lib-$(CONFIG_LOSETUP) += loop.o
 lib-$(CONFIG_FEATURE_MTAB_SUPPORT) += mtab.o
-lib-$(CONFIG_PASSWD) += pw_encrypt.o crypt_make_salt.o
+lib-$(CONFIG_PASSWD) += pw_encrypt.o crypt_make_salt.o update_passwd.o
+lib-$(CONFIG_CHPASSWD) += pw_encrypt.o crypt_make_salt.o update_passwd.o
 lib-$(CONFIG_CRYPTPW) += pw_encrypt.o crypt_make_salt.o
 lib-$(CONFIG_SULOGIN) += pw_encrypt.o
 lib-$(CONFIG_FEATURE_HTTPD_AUTH_MD5) += pw_encrypt.o