Fixes <https://issues.guix.gnu.org/60947>.
Fixes a bug whereby packages referred via 'ungexp' in package arguments
would be "double-grafted": 'gexp->derivation' would first replace those
references by references to the grafted package, only to repeat the
grafting process on the result.
Build systems such as 'gnu', 'cmake', and 'pyproject' were already doing
this. Only the rest of them is affected.
* guix/build-system/cargo.scm (cargo-build): Pass #:graft? #f to
'gexp->derivation'.
* guix/build-system/copy.scm (copy-build): Likewise.
* guix/build-system/dune.scm (dune-build): Likewise.
* guix/build-system/font.scm (font-build): Likewise.
* guix/build-system/guile.scm (guile-build): Likewise.
(guile-cross-build): Likewise.
* guix/build-system/ocaml.scm (ocaml-build): Likewise.
* guix/build-system/ruby.scm (ruby-build): Likewise.
* guix/build-system/scons.scm (scons-build): Likewise.
* guix/build-system/texlive.scm (texlive-build): Likewise.
* guix/build-system/waf.scm (waf-build): Likewise.
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