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.

git-svn-id: svn://svn.linuxfromscratch.org/ALFS/jhalfs/trunk@3816 7d5e3409-5ede-0310-83dd-dbcb3a32f907