bug#6967: flymake not cleaning after itself (kill-buffer)

[S Boucher]

That's with emacs 23.2

flymake-kill-buffer-hook does not actually kill the flymake process.  So, if 
flymake is used in conjunction with semantic, it gets problematic.

When semantic does background parsing, it may find-file/kill-buffer for files 
not already in memory.  If semantic proceeds to kill-buffer while a flymake 
process is running, then a window pops up asking whether the buffer's process 
should be killed (because kill-buffer asks before killing processes).

It seems like flymake-kill-buffer-hook should kill the buffer, so that by the 
time semantic calls kill-buffer, there won't be a process to query about.