Use non-recursive string.subst

The patch comes from Debian:
https://anonscm.debian.org/cgit/collab-maint/docbook-xsl.git/tree/debian/patches/765567_non-recursive_string_subst.patch

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 <pdewacht@gmail.com>
+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">

docbook-style-xsl.spec

@@ -1,6 +1,6 @@
 Name: docbook-style-xsl
 Version: 1.79.2
-Release: 5%{?dist}
+Release: 6%{?dist}
 Group: Applications/Text
 
 Summary: Norman Walsh's XSL stylesheets for DocBook XML
@@ -38,7 +38,8 @@ Patch4: docbook-xsl-non-constant-expressions.patch
 Patch5: docbook-xsl-list-item-body.patch
 #workaround missing mandir section problem (#727251)
 Patch6: docbook-xsl-mandir.patch
-
+#Non-recursive string.subst that doesn't kill smb.conf.5 generation
+Patch7: docbook-style-xsl-non-recursive-string-subst.patch
 
 %description
 These XSL stylesheets allow you to transform any DocBook XML document to
@@ -58,6 +59,7 @@ popd
 %patch4 -p1 -b .nonconstant
 %patch5 -p1 -b .listitembody
 %patch6 -p1 -b .mandir
+%patch7 -p2 -b .non-recursive-subst
 
 cp -p %{SOURCE1} Makefile
 
@@ -137,6 +139,9 @@ if [ "$1" = 0 ]; then
 fi
 
 %changelog
+* Wed Sep 13 2017 Alexander Bokovoy <abokovoy@redhat.com> - 1.79.2-6
+- Use non-recursive string.subst to allow building large documents like smb.conf.5
+
 * Wed Jul 26 2017 Fedora Release Engineering <releng@fedoraproject.org> - 1.79.2-5
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_27_Mass_Rebuild