Emacsg: init: Silence bogus warnings on newer Emacsen

I mean, what am I supposed to do here?  26.1 doesn't
want to use `if-let' and 25.3 doesn't have `if-let*'.

init.el

@@ -30,6 +30,11 @@
   (require  'use-package)
   (setq use-package-verbose t))
 
+(use-package subr-x
+  :config
+  (put 'if-let   'byte-obsolete-info nil)
+  (put 'when-let 'byte-obsolete-info nil))
+
 (use-package auto-compile
   :demand t
   :config