Log Message:
Update to 3.1.8:

Changes from 3.1.7 to 3.1.8
---------------------------
1. The zero flag no longer applies to %c and %s; apparently the standards
   changed at some point.

2. Updated to latest infrastructure: Autoconf 2.65, Automake 1.11.1,
   libtool 2.2.6b, Bison 2.4.2.

3. Failure to open a socket is no longer a fatal error.

4. dfa.h and dfa.c are now more-or-less in sync with GNU grep, for the first
   time in many years.

5. 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.

6. The ' flag (%'d) is now just ignored on systems that can't support it.

7. Lots of bug fixes, see the ChangeLog.