* libmisc/limits.c, libmisc/obscure.c, src/login_nopam.c,

lib/pwauth.c: Avoid empty file when USE_PAM is set.
* src/login_nopam.c: Fix warnings: resolve_hostname takes and
  returns a constant string.

libmisc/limits.c

@@ -441,4 +441,6 @@ void setup_limits (const struct passwd *info)
 	}
 }
 
+#else				/* !USE_PAM */
+extern int errno;		/* warning: ANSI C forbids an empty source file */
 #endif				/* !USE_PAM */