*: BB_BANNER -> bb_banner (it is not a const or #define)!
correct_password: explain in detail why it is ok to use bb_banner
fsck_minix: make it print bb version, not it's own (outdated/irrelevant) one

Marginal size difference:
   text    data     bss     dec     hex filename
 679119    2700   15632  697451   aa46b busybox_old
 679091    2700   15632  697423   aa44f busybox_unstripped


diff --git a/include/libbb.h b/include/libbb.h
index 5aa95ea..c0c417c 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -927,9 +927,8 @@
 #define FILEUTILS_CP_OPTSTR "pdRfils" USE_SELINUX("c")
 extern const struct bb_applet *current_applet;
 extern const char *applet_name;
-extern const char BB_BANNER[];
-
-extern const char bb_msg_full_version[];
+/* "BusyBox vN.N.N (timestamp or extra_vestion)" */
+extern const char bb_banner[];
 extern const char bb_msg_memory_exhausted[];
 extern const char bb_msg_invalid_date[];
 extern const char bb_msg_read_error[];