gnu: glibc-locales: Install to lib/locales.

Suggested by Andreas Schwab <schwab@linux-m68k.org>
at <http://lists.gnu.org/archive/html/guix-devel/2015-02/msg00652.html>.

* gnu/packages/base.scm (glibc-locales) <#:configure-flags>: Change
  "/share/locale" to "/lib/locale".

gnu/packages/base.scm

@@ -551,9 +551,10 @@ (define-public glibc-locales
             (alist-delete 'install ,phases)))
          ((#:configure-flags flags)
           `(append ,flags
+                   ;; Use $(libdir)/locale as is the case by default.
                    (list (string-append "libc_cv_localedir="
                                         (assoc-ref %outputs "out")
-                                        "/share/locale")))))))))
+                                        "/lib/locale")))))))))
 
 (define-public tzdata
   (package