- update to 3.1.8:
  * The zero flag no longer applies to %c and %s; apparently the standards
  changed at some point.
  * Failure to open a socket is no longer a fatal error.
  * dfa.h and dfa.c are now more-or-less in sync with GNU grep, for the first
  time in many years.
  * Gawk no longer includes its own copy of libsigsegv but it will use it if
  installed on the build system. The --disable-libsigsegv configure option
  is now gone.
  * The ' flag (%'d) is now just ignored on systems that can't support it.
  * Gawk now has support for z/OS (IBM S/390 architecture).
  * Gawk now handles multibyte strings better in [s]printf with field
   widths and such.
  * A getline from a directory is no longer fatal; instead it returns -1.
  * Per POSIX, special variable names (like FS) cannot be used as function
   parameter names.
  * The new -O / --optimize option enables simple constant folding on
  the parse tree during parsing.  We hope that with time the number
  of optimizations will increase.
  * Lots of bug fixes, see the ChangeLog.

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