mes: misc: Remove 'guile?' and 'mes?'.

* module/mes/misc.scm (guile?): Remove variable.
(mes?): Remove variable.

module/mes/misc.scm

@@ -20,8 +20,6 @@
   #:use-module (srfi srfi-1)
   #:export (%scheme
             disjoin
-            guile?
-            mes?
             pk
             pke
             warn
@@ -34,9 +32,6 @@
  (guile
   (define %scheme "guile")))
 
-(define guile? (equal? %scheme "guile"))
-(define mes? (equal? %scheme "mes"))
-
 (define (logf port string . rest)
   (apply format (cons* port string rest))
   (force-output port)