mkosi: remove intltool from deps

intltool is unnecessary since c81217920e.
But we still need gettext, because we use msgformat to generate .mo files.
(I tried to make meson depend on it, at least in Fedora:
 https://bugzilla.redhat.com/show_bug.cgi?id=1545926, but that didn't fly,
 and in Debian at least meson also has no dependency on the tools used by
 its i18n module, so we need to add our own dependency anyway.)

Closes #8192.

.mkosi/mkosi.arch

@@ -41,11 +41,11 @@ BuildPackages=
         docbook-xsl
         elfutils
         gcc
+        gettext
         git
         gnu-efi-libs
         gnutls
         gperf
-        intltool
         iptables
         kmod
         libcap

.mkosi/mkosi.debian

@@ -37,10 +37,10 @@ BuildPackages=
         docbook-xml
         docbook-xsl
         gcc
+        gettext
         git
         gnu-efi
         gperf
-        intltool
         iptables-dev
         libacl1-dev
         libaudit-dev

.mkosi/mkosi.fedora

@@ -41,12 +41,12 @@ BuildPackages=
         docbook-style-xsl
         elfutils-devel
         gcc
+        gettext
         git
         gnu-efi
         gnu-efi-devel
         gnutls-devel
         gperf
-        intltool
         iptables-devel
         kmod-devel
         libacl-devel