gnu: Depend on 'gettext-minimal' rather than 'gettext' when appropriate.

* gnu/packages/backup.scm (duplicity)[native-inputs]: Use
GETTEXT-MINIMAL instead of GNU-GETTEXT.
* gnu/packages/mpd.scm (mpdris2)[native-inputs]: Likewise.
* gnu/packages/guile-xyz.scm (nomad)[native-inputs]: Likewise.
(guile-mkdir-p)[native-inputs]: Likewise.
(guile-avahi)[native-inputs]: Remove GNU-GETTEXT, now unneeded.

gnu/packages/backup.scm

@@ -94,7 +94,7 @@
        (base32 "1kg467mxg5a97v1rlv4shk32krgv8ys4nczq4b11av4bp1lgysdc"))))
     (build-system python-build-system)
     (native-inputs
-     `(("gettext" ,gnu-gettext)         ; for msgfmt
+     `(("gettext" ,gettext-minimal)     ; for msgfmt
        ("util-linux" ,util-linux)       ; setsid command, for the tests
        ("par2cmdline" ,par2cmdline)
        ("python-fasteners" ,python-fasteners)

gnu/packages/guile-xyz.scm

@@ -3170,7 +3170,7 @@ perform geometrical transforms on JPEG images.")
        ("guile" ,guile-2.2)
        ("glib:bin" ,glib "bin")
        ("texinfo" ,texinfo)
-       ("gettext" ,gnu-gettext)
+       ("gettext" ,gettext-minimal)
        ("perl" ,perl)))
     (inputs
      `(;; Guile
@@ -4095,7 +4095,6 @@ errors.")
        `(("autoconf" ,autoconf)
          ("automake" ,automake)
          ("libtool" ,libtool)
-         ("gettext" ,gnu-gettext)
          ("pkg-config" ,pkg-config)
          ("texinfo" ,texinfo)))
       (synopsis "Guile bindings to Avahi")
@@ -4134,7 +4133,7 @@ Discovery (DNS-SD).")
        ("autoconf-archive" ,autoconf-archive)
        ("automake" ,automake)
        ("pkg-config" ,pkg-config)
-       ("gettext" ,gnu-gettext)))
+       ("gettext" ,gettext-minimal)))
     (inputs `(("guile" ,guile-3.0)))
     (synopsis "Implementation of a recursive @code{mkdir} for Guile")
     (description

gnu/packages/mpd.scm

@@ -408,7 +408,7 @@ other MPD frontends.")
     (native-inputs
      `(("autoconf" ,autoconf)
        ("automake" ,automake)
-       ("gettext" ,gnu-gettext)
+       ("gettext" ,gettext-minimal)
        ("which" ,which)
        ("intltool" ,intltool)))
     (synopsis "MPRIS V2.1 support for MPD")