HPUX11 must be tested before HPUX, since the former

  HPUX11 must be tested before HPUX, since the former
  is a superset of the other, and sane environments may
  define both.

  In the process, define HAVE_MMAP and USE_MMAP_FILES.
  Testing confirms this works fine.

  Drop the commented-out USE_MMAP_SCOREBOARD and
  HAVE_PTHREAD_SERIALIZED_ACCEPT defines, since they
  don't suggest the corresponding USE_SHMGET_SCOREBOARD
  and HAVE_FCNTL_SERIALIZED_ACCEPT must be commented out
  for the compiled httpd to behave as expected.  Also,
  the other platforms don't show alternatives, so this
  seemed inconsistent.

  In testing, USE_MMAP_SCOREBOARD works just fine, however
  USE_SHMGET_SCOREBOARD is preferred on linux where both
  are also supported, so I left the current default and
  followed the linux preference.

  Have not tested HAVE_PTHREAD_SERIALIZED_ACCEPT.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@103812 13f79535-47bb-0310-9956-ffa450edef68