derivations: Add 'raw-derivation'.

* guix/derivations.scm (raw-derivation): New procedure.
* guix/download.scm (raw-derivation): Remove.
* guix/gexp.scm (raw-derivation): Remove.

guix/derivations.scm

@@ -86,6 +86,7 @@
             derivation-path->output-path
             derivation-path->output-paths
             derivation
+            raw-derivation
 
             map-derivation
 
@@ -1306,3 +1307,6 @@ ALLOWED-REFERENCES, DISALLOWED-REFERENCES, LOCAL-BUILD?, and SUBSTITUTABLE?."
 
 (define built-derivations
   (store-lift build-derivations))
+
+(define raw-derivation
+  (store-lift derivation))

guix/download.scm

@@ -322,9 +322,6 @@ the daemon."
                       result))
                 store)))))
 
-(define raw-derivation
-  (store-lift derivation))
-
 (define* (built-in-download file-name url
                             #:key system hash-algo hash
                             mirrors content-addressed-mirrors

guix/gexp.scm

@@ -453,9 +453,6 @@ whether this should be considered a \"native\" input or not."
                           '()))
                        (gexp-references gexp)))))
 
-(define raw-derivation
-  (store-lift derivation))
-
 (define* (lower-inputs inputs
                        #:key system target)
   "Turn any package from INPUTS into a derivation for SYSTEM; return the