clean up some warnings in ab introduced in this release so that

gcc compiles it cleanly with

  -Wall -Wmissing-prototypes -Wstrict-prototypes -Wmissing-declarations

. make some qsort() comparison routines static so that no prototype
  is desired by gcc
. get rid of unused function pipehandler()


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@91003 13f79535-47bb-0310-9956-ffa450edef68