Make Eclector use our native backquote

eclector.reader:quasiquote is fine (a bit underoptimized but who
cares), but it's not available really early. The particular
problem I hit is that if we save macro names that are expanded
(see subsequent commit) we end up referring to the ECLECTOR.READER
package during startup, before eclector is loaded, causing problems.

src/lisp/kernel/cmp/eclector-client.lisp

@@ -34,3 +34,13 @@
   (core::make-structure
    name
    (map-make-structure-arguments initargs)))
+
+(defmethod eclector.reader:wrap-in-quasiquote
+    ((client clasp-eclector-client-mixin) form)
+  (list 'core:quasiquote form))
+(defmethod eclector.reader:wrap-in-unquote
+    ((client clasp-eclector-client-mixin) form)
+  (list 'core::unquote form))
+(defmethod eclector.reader:wrap-in-unquote-splicing
+    ((client clasp-eclector-client-mixin) form)
+  (list 'core::unquote-splice form))