Drop c99 mode to enable compilation on mingw

This avoids the 'unknown type name off_t' error that will otherwise
occur:

  http://sourceforge.net/p/mingw/bugs/2046/

Originally submitted at:

  https://github.com/wincent/Command-T/pull/63

Minor tweaks applied:

- squashed two commits into one
- reordered some lines to keep comments close to the lines they actually
  apply to
- de-c99-ize additional sites missed by original commit (eg. watchman.c
  file)

Signed-off-by: Wincent Colaiuta <win@wincent.com>
Add Roland Puntaier to AUTHORS section of docs

Signed-off-by: Wincent Colaiuta <win@wincent.com>
Merge branch 'rpuntaie/master' into next

* branch 'rpuntaie/master':
  Add Roland Puntaier to AUTHORS section of docs
  Drop c99 mode to enable compilation on mingw

Signed-off-by: Wincent Colaiuta <win@wincent.com>