Make the headers compile happily with pedantic C compilers.

Make the headers compile happily with pedantic C compilers.

Original message from SF patch 2797966:

    While commas at the end of enumerator lists are valid in c99, they
    are not valid +in c89 nor in c++. When using gcc/g++ with the
    -pedantic flag, users will +receive a warning (gcc) or an
    error(g++) when including the event2/event.h and
    +event2/bufferevent.h. The errors look something like

    event2/event.h:159: error: comma at end of enumerator list

Patch from Akita Noek on Sourceforge.

svn:r1321