Log Message:
   In the check_header() function, bump the number of allowed section headers
   to 512. Apparently, there are ELF binaries with more than 128 section
   headers - an example is one of Linux Word Perfect 8 utilities.
   
   This fixes kern/12455 by Mark Davies.


hmm... this binary has nearly 400 sections.  i argued against this limit
when it was first commited, and if we have something with 400 already, i
see no reason why someone else won't go over the newly arbitrarily
chosen limit of 512 (the actual hard limit is of course 64k.)  shouldn't
we guard against future lossage by increasing this, perhaps to 8k or
maybe even higher?


.mrg.