Clean up dependencies to itstool

Several packages have switched from itstool to gettext.

For evolution it can be disabled, so make it recommended instead of
required.

gnome/applications/eog.xml

@@ -75,7 +75,6 @@
       <xref linkend="adwaita-icon-theme"/>,
       <xref linkend="exempi"/>,
       <xref linkend="gnome-desktop"/>,
-      <xref linkend="itstool"/>,
       <xref linkend="libhandy1"/>,
       <xref linkend="libjpeg"/>,
       <xref linkend="libpeas"/>, and

gnome/applications/evince.xml

@@ -78,7 +78,6 @@
       <xref linkend="adwaita-icon-theme"/>,
       <xref linkend="gsettings-desktop-schemas"/>,
       <xref linkend="gtk3"/>,
-      <xref linkend="itstool"/>,
       <xref linkend="libhandy1"/>,
       <xref linkend="libxml2"/>, and
       <xref linkend="openjpeg2"/>

gnome/applications/evolution.xml

@@ -87,7 +87,6 @@
       <xref linkend="evolution-data-server"/>,
       <xref linkend="gcr4"/>,
       <xref linkend="gnome-autoar"/>,
-      <xref linkend="itstool"/>,
       <xref linkend="shared-mime-info"/>, and
       <xref linkend="webkitgtk"/>
     </para>
@@ -99,6 +98,7 @@
       <xref linkend="gnome-desktop"/>,
       <xref linkend="gspell"/>,
       <xref linkend="highlight"/>,
+      <xref linkend="itstool"/>,
       <xref linkend="libcanberra"/>,
       <xref linkend="libgweather"/>,
       <xref linkend="libnotify"/>,
@@ -193,6 +193,12 @@ ninja</userinput></screen>
       building against <xref linkend="libgweather"/>.
     </para>
 
+    <para>
+      <option>-DWITH_HELP=OFF</option>: This switch disables building the
+      manual of this package.  Use this switch if you have not installed
+      <xref linkend='itstool'/>.
+    </para>
+
     <para>
       <option>-DWITH_OPENLDAP=OFF</option>: Use this switch if you
       have not installed <xref linkend='openldap'/>.

gnome/applications/seahorse.xml

@@ -76,7 +76,6 @@
       <xref linkend="gcr"/>,
       <xref linkend="gnupg2"/>,
       <xref linkend="gpgme"/>,
-      <xref linkend="itstool"/>,
       <xref linkend="libhandy1"/>,
       <xref linkend="libpwquality"/> and
       <xref linkend="libsecret"/>

gnome/platform/gnome-bluetooth.xml

@@ -75,7 +75,6 @@
     <para role="required">
       <xref linkend="gtk4"/>,
       <xref linkend="gsound"/>,
-      <xref linkend="itstool"/>,
       <xref linkend="libnotify"/>, and
       <xref linkend="upower"/>
     </para>

gnome/platform/gnome-desktop.xml

@@ -77,7 +77,6 @@
       <xref linkend="gtk3"/>,
       <xref linkend="gtk4"/>,
       <xref linkend="iso-codes"/>,
-      <xref linkend="itstool"/>,
       <xref linkend="libseccomp"/>,
       <xref linkend="libxml2"/>, and
       <xref linkend="xkeyboard-config"/>