gnu: Fix another call to cross-gcc.

This is a followup to commit 7b3318e34f.

* gnu/packages/make-bootstrap.scm (package-with-relocatable-glibc)
[native-inputs]: Fix 'cross-gcc' call.
* gnu/packages/cross-base.scm: Fix example 'cross-gcc' call in a comment.

gnu/packages/cross-base.scm

@@ -494,8 +494,8 @@ XBINUTILS and the cross tool chain."
 ;; (define-public xgcc-armhf
 ;;   (let ((triplet "arm-linux-gnueabihf"))
 ;;     (cross-gcc triplet
-;;                (cross-binutils triplet)
-;;                (cross-libc triplet))))
+;;                #:xbinutils (cross-binutils triplet)
+;;                #:libc (cross-libc triplet))))
 ;;
 ;;; We don't do that here because we'd be referring to bindings from (gnu
 ;;; packages gcc) from the top level, which doesn't play well with circular

gnu/packages/make-bootstrap.scm

@@ -99,8 +99,8 @@ for `sh' in $PATH, and without nscd, and with static NSS modules."
     (if (%current-target-system)
         (let ((target (%current-target-system)))
           `(("cross-gcc"      ,(cross-gcc target
-                                          (cross-binutils target)
-                                          (cross-bootstrap-libc)))
+                                          #:xbinutils (cross-binutils target)
+                                          #:libc (cross-bootstrap-libc)))
             ("cross-binutils" ,(cross-binutils target))
             ,@(%final-inputs)))
         `(("libc" ,(glibc-for-bootstrap))