Doing some cleanup.

third_party/docbook-xsl-1.78.0/params/index.prefer.titleabbrev.xml

Index: third_party/docbook-xsl-1.78.0/params/index.prefer.titleabbrev.xml
diff --git a/third_party/docbook-xsl-1.78.0/params/index.prefer.titleabbrev.xml b/third_party/docbook-xsl-1.78.0/params/index.prefer.titleabbrev.xml
deleted file mode 100644
index 3f010ae8ddfeb702c1a7d2e84b191301471305c2..0000000000000000000000000000000000000000
--- a/third_party/docbook-xsl-1.78.0/params/index.prefer.titleabbrev.xml
+++ /dev/null
@@ -1,29 +0,0 @@
-<refentry xmlns="http://docbook.org/ns/docbook"
-          xmlns:xlink="http://www.w3.org/1999/xlink"
-          xmlns:xi="http://www.w3.org/2001/XInclude"
-          xmlns:src="http://nwalsh.com/xmlns/litprog/fragment"
-          xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
-          version="5.0" xml:id="index.prefer.titleabbrev">
-<refmeta>
-<refentrytitle>index.prefer.titleabbrev</refentrytitle>
-<refmiscinfo class="other" otherclass="datatype">boolean</refmiscinfo>
-</refmeta>
-<refnamediv>
-<refname>index.prefer.titleabbrev</refname>
-<refpurpose>Should abbreviated titles be used as back references?</refpurpose>
-</refnamediv>
-
-<refsynopsisdiv>
-<src:fragment xml:id="index.prefer.titleabbrev.frag">
-<xsl:param name="index.prefer.titleabbrev" select="0"/>
-</src:fragment>
-</refsynopsisdiv>
-
-<refsection><info><title>Description</title></info>
-
-<para>If non-zero, and if a <tag>titleabbrev</tag> is defined, the abbreviated title
-is used as the link text of a back reference in the index.
-</para>
-
-</refsection>
-</refentry>