Version reporting patch

[Jeremy Leader]

It would be handy if protoxs reported its own version, as well as the
libprotoc version, in response to the --version option.

Here's a patch which will do so. Caveat: my autotools fu (never that
extensive to begin with) has been gathering dust for roughly a year, so
please let me know if I screwed up somehow.

--
Jeremy Leader
jle...@oversee.net

[Dave Bailey]

Thanks Jeremy!  This worked perfectly, and I've committed it to SVN, so it'll be in 0.8 when that comes out.

-dave