Fix 2 minor bugs:

- the tzdata DESTDIR should not be tzdata, because some package managers use
$PACKAGE as their working directory, and this may conflicts with this one.
tzdata DESTDIR is now 001-tzdata
- when reading md5sums, the current code assumes that there is only one
<para><literal> node reachable from ../.. (relative to <ulink>). This is true
for the "official" book, but not necessarily for the snippets written for
package management. The following change only assumes that the md5sum
<para><literal> for a given <ulink> is the first one after <para><ulink>,
which does not change anything for the book, and is better for user
written snippets.

LFS/lfs.xsl

@@ -455,7 +455,7 @@ exit
         <xsl:text>
 OLD_PKG_DEST=$PKG_DEST
 OLD_PKGDIR=$PKGDIR
-PKG_DEST=$(dirname $OLD_PKG_DEST)/tzdata
+PKG_DEST=$(dirname $OLD_PKG_DEST)/001-tzdata
 PKGDIR=$(dirname $PKGDIR)/tzdata-</xsl:text>
         <xsl:copy-of select="substring-before(
                                substring-after(string(),'tzdata'),

common/urls.xsl

@@ -109,7 +109,7 @@
       <xsl:value-of select="$package"/>
       <!-- Write MD5SUM value -->
       <xsl:text> </xsl:text>
-      <xsl:value-of select="../..//para/literal"/>
+      <xsl:value-of select="../following-sibling::para/literal"/>
       <xsl:text>&#x0a;</xsl:text>
     </xsl:if>
   </xsl:template>