Correct soem pcre dependencies which were outdated.

general/prog/php.xml

@@ -129,7 +129,7 @@ Time taken      :  520 seconds
       <xref linkend="libxslt"/>,
       an <xref linkend="server-mail"/> (that provides a
       <command>sendmail</command> command),
-      <xref linkend="pcre"/>,
+      <xref linkend="pcre2"/>,
       <xref linkend="pth"/>,
       <ulink url="https://wiki.ubuntu.com/AppArmor">AppArmor</ulink>,
       <ulink url="http://dmalloc.com/">Dmalloc</ulink>,

introduction/welcome/changelog.xml

@@ -41,6 +41,15 @@
       </itemizedlist>
     </listitem>
     -->
+    <listitem>
+      <para>October 16th, 2021</para>
+      <itemizedlist>
+        <listitem>
+          <para>[ken] - Tidy some obsolete pcre references: php can use pcre2 not
+          the original pcre, balsa and lightdm no longer reference pcre.</para>
+        </listitem>
+      </itemizedlist>
+    </listitem>
 
     <listitem>
       <para>October 12th, 2021</para>

x/dm/lightdm.xml

@@ -129,9 +129,11 @@
       <xref linkend="exo"/> (for the greeter),
 <!-- required by exo      <xref linkend="gtk3"/>, -->
       <xref linkend="libgcrypt"/>,
-      <xref linkend="itstool"/>,
-      <xref linkend="linux-pam"/>, and
-      <xref linkend="pcre"/>
+      <xref linkend="itstool"/>, and
+      <xref linkend="linux-pam"/>
+<!-- Neither lightdm-1.30.0 nor lightdm-gtk-greeter-2.0.8
+     mention pcre in their configure scripts
+      <xref linkend="pcre"/>-->
     </para>
 
     <bridgehead renderas="sect4">Recommended</bridgehead>

xsoft/other/balsa.xml

@@ -88,10 +88,14 @@
       <command>sendmail</command> command)
     </para>
 
+<!-- in 2.6.3 the only references to pcre are in the old spec file,
+     the INSTALL file which seems to be out of date,
+     and the ChangeLog where it was defaulted to off in 2008.
+     Not mentioned in configure.
     <bridgehead renderas="sect4">Recommended</bridgehead>
     <para role="recommended">
       <xref linkend="pcre"/>
-    </para>
+    </para>-->
 
     <bridgehead renderas="sect4">Optional</bridgehead>
     <para role="optional">