documentation corrections that may be useful

Some minor corrections to the documentation that will probably help users.
<http://tonycode.com/wiki/index.php?title=Setting_up_DJBDNS_on_Linux>

1st suggestion is to mention the Linux bug fix on on daemontools and
ucspi-tcp install pages.  I googled for the fix then found it on the djbdns
when I was done.  :-)

Then a minor issue on the http://cr.yp.to/djbdns/run-server.html page.

Here are my notes.


   - Main page
      - http://cr.yp.to/djbdns.html
   - Install instructions are here
      - http://cr.yp.to/djbdns/install.html
   - My corrections
      - avoid this error(/usr/bin/ld: errno: TLS definition in
      /lib64/libc.so.6 section .tbss mismatches non-TLS reference in envdir.o)
      - When installing daemontools http://cr.yp.to/daemontools/install.html
         - before running install edit this file
         - vi src/conf-cc
            - add this to end of gcc line
            - -include /usr/include/errno.h
          - When installing ucspi-tcp http://cr.yp.to/ucspi-tcp/install.html
         - vi conf-cc
         - add this to end of gcc line
         - -include /usr/include/errno.h
      - The above linux bug fix is documented in the djbdns instructions but
      when following the installs sequentially you miss the note


   - How to run a DNS server notes
      - http://cr.yp.to/djbdns/run-server.html

4. On the second computer, as root, edit /service/tinydns/root/data to
remind yourself that DNS data is replicated from the first computer to
the second:

     # Do not edit data on this computer! data.cdb is copied from 1.8.7.200.
     # The following line protects data.cdb by stopping make.
     9

*/service/tinydns/root/data* does not exist until step 5. use
/etc/tinydns/root/data