Log Message:
Update to 5.9.2:

- 5.9.2 | 2013-11-28

  - bugfixes

    - avoid possibly failing command in backticks

      Some versions of Solaris /bin/sh would cause the extract-help
      build script to exit failurefully when the grep command in the
      backticks failed (in the presence of "set -e").  Sigh.

    - handle low-memory situations like RCS 5.7 (mostly)

      For reading comma-v files, RCS 5.7 tries mmap(2), in-core
      snarfing, and stdio access, falling back to slower methods
      on failure of the faster method.  RCS 5.8 maintained the order,
      but did not fall back; on failure, it gave up immediately.
      This change was originally viewed as a feature, but lately it
      seemed more like a bug.

      Now, RCS 5.7 behavior is for the most part restored.  The
      exception is when env var ‘RCS_MEM_LIMIT’ is set; in that case,
      failure of a fast method does not fall back to the slower one.

  - default for env var ‘RCS_MEM_LIMIT’ relaxed

    This used to be 256 kilobytes, a reasonable value a long time
    ago, but ridiculously low nowadays.  Now, it is "unlimited",
    which is more in line w/ the GNU philosophy, anyway:

     (info "(standards) Semantics")

    Since the env var is mostly intended for testing RCS, you can
    normally leave it unset.  (Probably it will be removed in a
    future release.)

  - maintenance tools updated
    - automake (GNU automake) 1.14
    - gnulib-tool (GNU gnulib 2013-11-28 08:46:06) 0.1.21-37f8a