utils: Remove compatibility re-export of 'memoize'.

The 'memoize' binding was re-exported in 2016, commit
19e1d5f7f9, as a backwards-compatibility
measure that makes little sense now.

* guix/utils.scm: Don't re-export 'memoize'.
* guix/import/pypi.scm: Adjust imports.
* tests/pypi.scm: Remove duplicate (guix memoization) import.

guix/import/pypi.scm

@@ -34,8 +34,10 @@
   #:use-module (srfi srfi-26)
   #:use-module (srfi srfi-34)
   #:use-module (srfi srfi-35)
-  #:use-module (guix ui)
   #:use-module (guix utils)
+  #:use-module (guix memoization)
+  #:use-module (guix diagnostics)
+  #:use-module (guix i18n)
   #:use-module ((guix build utils)
                 #:select ((package-name->name+version
                            . hyphen-package-name->name+version)

guix/utils.scm

@@ -44,9 +44,7 @@
   #:use-module (ice-9 format)
   #:use-module ((ice-9 iconv) #:prefix iconv:)
   #:use-module (system foreign)
-  #:re-export (memoize                            ;for backwards compatibility
-
-               <location>
+  #:re-export (<location>                         ;for backwards compatibility
                location
                location?
                location-file

tests/pypi.scm

@@ -23,7 +23,6 @@
   #:use-module (guix base32)
   #:use-module (guix memoization)
   #:use-module (gcrypt hash)
-  #:use-module (guix memoization)
   #:use-module (guix tests)
   #:use-module (guix build-system python)
   #:use-module ((guix build utils) #:select (delete-file-recursively which mkdir-p))