textproc/docbook-xsl: sync with upstream

Taken from: HardenedBSD

textproc/docbook-xsl/Makefile

@@ -2,6 +2,7 @@
 
 PORTNAME=	docbook-xsl
 PORTVERSION=	1.79.1
+PORTREVISION=	1
 PORTEPOCH=	1
 CATEGORIES=	textproc
 MASTER_SITES=	SF/docbook/${PORTNAME}/${PORTVERSION}:src \
@@ -18,6 +19,8 @@ BUILD_DEPENDS=	xmlcatmgr:textproc/xmlcatmgr
 RUN_DEPENDS=	docbook>=0:textproc/docbook \
 		xmlcatmgr:textproc/xmlcatmgr
 
+EXTRA_PATCHES=	${PATCHDIR}/docbook-style-xsl-non-recursive-string-subst.patch:-p2
+
 USES=		tar:bzip2
 
 NO_ARCH=	yes

textproc/docbook-xsl/files/docbook-style-xsl-non-recursive-string-subst.patch

@@ -0,0 +1,30 @@
+Description: use EXSLT "replace" function when available
+ A recursive implementation  of string.subst is problematic,
+ long strings with many matches will cause stack overflows.
+Author: Peter De Wachter <[email protected]>
+Bug-Debian: https://bugs.debian.org/750593
+
+--- docbook-xsl-1.78.1+dfsg.orig/docbook-xsl/lib/lib.xsl
++++ docbook-xsl-1.78.1+dfsg/docbook-xsl/lib/lib.xsl
+@@ -10,7 +10,10 @@
+      This module implements DTD-independent functions
+
+      ******************************************************************** -->
+-<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
++<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
++                xmlns:str="http://exslt.org/strings"
++                exclude-result-prefixes="str"
++                version="1.0">
+
+ <xsl:template name="dot.count">
+   <!-- Returns the number of "." characters in a string -->
+@@ -56,6 +59,9 @@
+   <xsl:param name="replacement"/>
+
+   <xsl:choose>
++    <xsl:when test="function-available('str:replace')">
++      <xsl:value-of select="str:replace($string, string($target), string($replacement))"/>
++    </xsl:when>
+     <xsl:when test="contains($string, $target)">
+       <xsl:variable name="rest">
+         <xsl:call-template name="string.subst">