glossary: remove perforce related entries

We no longer run a p4 server, and upstream stopped supporting fbsd, so
stop documenting it.

en_US.ISO8859-1/share/xml/glossary.ent

@@ -969,11 +969,6 @@
       <glosssee otherterm="mfh-glossary"/>
     </glossentry>
 
-    <glossentry>
-      <glossterm>MFP4</glossterm>
-      <glosssee otherterm="mfp4-glossary"/>
-    </glossentry>
-
     <glossentry>
       <glossterm>MFS</glossterm>
       <glosssee otherterm="mfs-glossary"/>
@@ -1058,16 +1053,6 @@
       </glossdef>
     </glossentry>
 
-    <glossentry xml:id="mfp4-glossary">
-      <glossterm>Merge From Perforce</glossterm>
-      <acronym>MFP4</acronym>
-      <glossdef subject="FreeBSD">
-	<para>To merge functionality or a patch from the Perforce
-	  repository to the -CURRENT branch.</para>
-	<glossseealso otherterm="perforce-glossary"/>
-      </glossdef>
-    </glossentry>
-
     <glossentry xml:id="mfs-glossary">
       <glossterm>Merge From Stable</glossterm>
       <acronym>MFS</acronym>
@@ -1230,11 +1215,6 @@
   <glossdiv>
     <title>P</title>
 
-    <glossentry>
-      <glossterm>p4</glossterm>
-      <glosssee otherterm="perforce-glossary"/>
-    </glossentry>
-
     <glossentry>
       <glossterm>PAE</glossterm>
       <glosssee otherterm="pae-glossary"/>
@@ -1339,20 +1319,6 @@
       </glossdef>
     </glossentry>
 
-    <glossentry xml:id="perforce-glossary">
-      <glossterm>Perforce</glossterm>
-      <glossdef>
-	<para>A source code control product made by
-	  <link xlink:href="http://www.perforce.com/">Perforce Software</link>.
-	  Although not open source, its use
-	  is free of charge to open-source projects such as &os;.</para>
-
-	<para>Some &os; developers use a Perforce repository as a staging
-	  area for code that is considered too experimental for the
-	  -CURRENT branch.</para>
-      </glossdef>
-    </glossentry>
-
     <glossentry xml:id="pc-glossary">
       <glossterm>Personal Computer</glossterm>
       <acronym>PC</acronym>