- 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.