Remove mention of pkg-req: it is only used in about 20 places now and it is deprecated.

Discussed with:	bdrewery

en_US.ISO8859-1/books/porters-handbook/book.xml

@@ -10220,24 +10220,6 @@ etc/orbit.conf.sample
 	  POST-DEINSTALL</literal>.</para>
     </sect1>
 
-    <sect1 id="pkg-req">
-      <title><filename>pkg-req</filename></title>
-
-      <para>If your port needs to determine if it should install or
-	not, you can create a <filename>pkg-req</filename>
-	<quote>requirements</quote> script.  It will be invoked
-	automatically at installation/de-installation time to
-	determine whether or not installation/de-installation should
-	proceed.</para>
-
-      <para>The script will be run at installation time by
-	&man.pkg.add.1; as
-	<literal>pkg-req &dollar;{PKGNAME} INSTALL</literal>.
-	At de-installation time it will be run by
-	&man.pkg.delete.1; as
-	<literal>pkg-req &dollar;{PKGNAME} DEINSTALL</literal>.</para>
-    </sect1>
-
     <sect1 id="pkg-names">
       <title id="porting-pkgfiles">Changing the Names of
 	<filename>pkg-<replaceable>*</replaceable></filename>
@@ -10290,11 +10272,6 @@ etc/orbit.conf.sample
 	      <entry><literal>${PKGDIR}/pkg-deinstall</literal></entry>
 	    </row>
 
-	    <row>
-	      <entry><makevar>PKGREQ</makevar></entry>
-	      <entry><literal>${PKGDIR}/pkg-req</literal></entry>
-	    </row>
-
 	    <row>
 	      <entry><makevar>PKGMESSAGE</makevar></entry>
 	      <entry><literal>${PKGDIR}/pkg-message</literal></entry>
@@ -10332,8 +10309,9 @@ etc/orbit.conf.sample
 	added to the <makevar>SUB_FILES</makevar>.  For the files
 	<filename>pkg-message</filename>,
 	<filename>pkg-install</filename>,
-	<filename>pkg-deinstall</filename> and
-	<filename>pkg-req</filename>, the corresponding Makefile
+	and
+	<filename>pkg-deinstall</filename>,
+	the corresponding Makefile
 	variable is automatically set to point to the processed
 	version.</para>