Back out controversial abstraction of read()/write(). As couple

of people have pointed out, this is probably too major a change
this late in the game. My main intent was to clean up some of
the code where read()/write() is called in buff.c. Putting these
in libap seemed the logical place, but opens a whole can of worms
I did not forsee.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80105 13f79535-47bb-0310-9956-ffa450edef68