* src/newgrp.c, src/userdel.c, src/grpck.c, src/gpasswd.c,

src/newusers.c, src/pwconv.c, src/chpasswd.c, src/logoutd.c,
	src/chfn.c, src/groupmems.c, src/usermod.c, src/pwunconv.c,
	src/expiry.c, src/groupdel.c, src/chgpasswd.c, src/useradd.c,
	src/su.c, src/groupmod.c, src/passwd.c, src/pwck.c, src/chage.c,
	src/groupadd.c, src/login.c, src/grpconv.c, src/groups.c,
	src/grpunconv.c, src/chsh.c: Prog changed to a constant string.

src/usermod.c

@@ -89,7 +89,7 @@
 /*
  * Global variables
  */
-char *Prog;
+const char *Prog;
 
 static char *user_name;
 static char *user_newname;