evolution-data-server: demote db to optional

gnome/platform/evolution-data-server.xml

@@ -89,7 +89,6 @@ xreflabel="evolution-data-server-&evolution-data-server-version;">
 
     <bridgehead renderas="sect4">Required</bridgehead>
     <para role="required">
-      <xref linkend="db"/>,
       <xref linkend="gcr"/>,
       <xref linkend="libical"/>,
       <xref linkend="libsecret"/>,
@@ -117,6 +116,7 @@ xreflabel="evolution-data-server-&evolution-data-server-version;">
 
     <bridgehead renderas="sect4">Optional</bridgehead>
     <para role="optional">
+      <xref linkend="db"/>,
       <xref linkend="gtk-doc"/>,
       <xref linkend="mitkrb"/>,
       a <xref linkend="server-mail"/> (that provides a <command>sendmail</command> command),
@@ -165,6 +165,7 @@ cmake -DCMAKE_INSTALL_PREFIX=/usr   \
       -DWITH_KRB5=OFF               \
       -DENABLE_INTROSPECTION=ON     \
       -DENABLE_GTK_DOC=OFF          \
+      -DWITH_LIBDB=OFF              \
       -DWITH_SYSTEMDUSERUNITDIR=no  \
       .. &amp;&amp;
 make</userinput></screen>
@@ -181,6 +182,7 @@ cmake -DCMAKE_INSTALL_PREFIX=/usr   \
       -DWITH_KRB5=OFF               \
       -DENABLE_INTROSPECTION=ON     \
       -DENABLE_GTK_DOC=OFF          \
+      -DWITH_LIBDB=OFF              \
       .. &amp;&amp;
 make</userinput></screen>
 
@@ -220,6 +222,13 @@ make</userinput></screen>
       that is no longer available.
     </para>
 
+    <para>
+      <parameter>-DWITH_LIBDB=OFF</parameter>: This switch allows building
+      this package without <xref linkend="db"/>.  This package only uses
+      <xref linkend="db"/> to import data from very outdated releases.
+      <xref linkend="sqlite"/> is used insteadly for normal operation.
+    </para>
+
     <para revision="sysv">
       <parameter>-DWITH_SYSTEMDUSERUNITDIR=no</parameter>: This switch
       disables installing the systemd units, which are not used for a Sysv